@article{Kummer2010,
  author    = {Kummer, Volker},
  title     = {Bemerkenswerte Pilzfunde auf der 38. Brandenburgischen Botanikertagung in Groß Pinnow/Uckermark},
  issn      = {9454-4292},
  year      = {2010},
  language  = {de}
}
@article{Kummer1994,
  author    = {Kummer, Volker},
  title     = {Bemerkenswerte Pilzfunde aus dem nordwestlichen Unterspreewald-Randgebiet},
  year      = {1994},
  language  = {de}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Beobachtungen zu Pithya cupressina andchloroscypha alutipes},
  year      = {1998},
  language  = {de}
}
@article{KummerMiersch2001,
  author    = {Kummer, Volker and Miersch, J{\"u}rgen},
  title     = {Bericht {\"u}ber eine einw{\"o}chige mykologische Exkursion nach Gotland im Herbst 1999},
  year      = {2001},
  language  = {de}
}
@article{Kummer2000,
  author    = {Kummer, Volker},
  title     = {Botanisch Bemerkenswertes aus der Potsdamer Umgebung : eine Auswahl},
  year      = {2000},
  language  = {de}
}
@article{Kummer1994,
  author    = {Kummer, Volker},
  title     = {Botanische Exkursion ins Wolfsbruch bei Alt T{\"o}plitz},
  year      = {1994},
  language  = {de}
}
@article{ScherberEisenhauerWeisseretal.2010,
  author    = {Scherber, Christoph and Eisenhauer, Nico and Weisser, Wolfgang W. and Schmid, Bernhard and Voigt, Winfried and Fischer, Markus and Schukze, Ernst-Detlef and Roscher, Christiane and Weigelt, Alexandra and Allan, Eric and Beßler, Holger and Bonkowski, Michael and Buchmann, Nina and Buscot, Fran{\c{c}}ois and Clement, Lars W. and Ebeling, Anne and Engels, Christof and Halle, Stefan and Kertscher, Ilona and Klein, Alexandra-Maria and Koller, Robert and K{\"o}nig, Stephan and Kowalski, Esther and Kummer, Volker and Kuu, Annely and Lange, Markus and Lauterbach, Dirk},
  title     = {Bottom-up effects of plant diversity on multitrophic interactions in a biodiversity experiment},
  issn      = {0028-0836},
  year      = {2010},
  language  = {en}
}
@article{Kummer1994,
  author    = {Kummer, Volker},
  title     = {B{\"u}rgert sich Gypsophila perfoliata in Brandenburg ein?},
  year      = {1994},
  language  = {de}
}
@article{Kummer2002,
  author    = {Kummer, Volker},
  title     = {Cochlearia danica nun auch in Brandenburg},
  year      = {2002},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Der Abriß der Neuen Sch{\"a}nke},
  year      = {1996},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Der Große Burgwall bei Havelberg : ein bemerkenswerter Pilzstandort},
  year      = {1997},
  language  = {de}
}
@article{Kummer2006,
  author    = {Kummer, Volker},
  title     = {Der L{\"u}bbener Rudolf Marloth (1855-1931) als Botaniker in S{\"u}dafrika - eine Lebensskizze},
  year      = {2006},
  language  = {de}
}
@article{KoernerSeitzJentschetal.2002,
  author    = {K{\"o}rner, Sabine and Seitz, Birgit and Jentsch, Helmut and Kummer, Volker},
  title     = {Der Spreewald : Lebensraum f{\"u}r gef{\"a}hrdete Pflanzenarten},
  year      = {2002},
  language  = {de}
}
@article{RaetzelKummer2010,
  author    = {Raetzel, Stefan and Kummer, Volker},
  title     = {Die Erforschung der in Brandenburg vorkommenden Kryptogamen nach 1945 (Moose, Pilze)},
  year      = {2010},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Die Exkursion zum Gollwitzer Havelufer},
  year      = {1996},
  language  = {de}
}
@article{KummerBurkart1997,
  author    = {Kummer, Volker and Burkart, Michael},
  title     = {Die Flora der Stromtalwiesen an der unteren Havel und andere botanische Besonderheiten},
  year      = {1997},
  language  = {de}
}
@article{Kummer1993,
  author    = {Kummer, Volker},
  title     = {Die Krausnicker Schule zu Beginn des 19. Jahrhunderts : ein Beitrag zur Gechichte des Unterspreewaldortes},
  year      = {1993},
  language  = {de}
}
@article{Kummer1995,
  author    = {Kummer, Volker},
  title     = {Die Salzbunge (Samolus valerandi) im Bornimer Schlangenbruch wieder gefunden},
  year      = {1995},
  language  = {de}
}
@article{KuehlingBorkKummer2000,
  author    = {K{\"u}hling, Matthias and Bork, Hans-Rudolf and Kummer, Volker},
  title     = {Die W{\"u}ste Atacama},
  year      = {2000},
  language  = {de}
}
@article{ThinesKummer2013,
  author    = {Thines, Marco and Kummer, Volker},
  title     = {Diversity and species boundaries in floricolous downy mildews},
  series = {Mycological progress : international journal of the German Mycological Society},
  volume    = {12},
  journal   = {Mycological progress : international journal of the German Mycological Society},
  number    = {2},
  publisher = {Springer},
  address   = {Heidelberg},
  issn      = {1617-416X},
  doi       = {10.1007/s11557-012-0837-7},
  pages     = {321 -- 329},
  year      = {2013},
  abstract  = {Floricolous downy mildews are a monophyletic group of members of the genus Peronospora (Oomycota, Peronosporales). These downy mildews can be found on a variety of families of the Asteridae, including Asteraceae, Campanulaceae, Dipsacaceae, Lamiaceae, and Orobanchaceae. With the exception of Peronospora radii, which can also cause economically relevant losses, sporulation usually takes place only on floral parts of their hosts. However, only very few specimens of these mostly inconspicuous downy mildews have so far been included in molecular phylogenies. Focusing on Lamiaceae, we have investigated multiple specimens of floricolous downy mildews for elucidating species boundaries and host specificity in this group. Based on both mitochondrial and nuclear loci, it became apparent that phylogenetic lineages in the Lamiaceae seem to be host genus specific and significant sequence diversity could be found between lineages. Based on distinctiveness in both phylogenetic reconstructions and morphology, the downy mildew on flowers of Stachys palustris is introduced as a new species, Peronospora jagei sp. nov., which can be morphologically distinguished from Peronospora stigmaticola by broader and shorter conidiospores. The diversity of the floricolous down mildews might be higher than previously assumed, although specimens from a much broader set of samples will be needed to confirm this view.},
  language  = {en}
}
@article{Kummer2004,
  author    = {Kummer, Volker},
  title     = {Dr. Dieter Benkert zum 70. Geburtstag},
  issn      = {0724-3111 -},
  year      = {2004},
  language  = {de}
}
@article{FischerKummer1995,
  author    = {Fischer, Wolfgang and Kummer, Volker},
  title     = {Ein Beitrag zur Pilzflora der H{\"o}llenberge bei Langengrassau},
  year      = {1995},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Ein Beitrag zur Pilzflora des G{\"o}rlsdorfer Waldes},
  year      = {1997},
  language  = {de}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Ein kurzer Einblick in die Vielfalt unserer heimischen Pilze},
  year      = {1998},
  language  = {de}
}
@article{Kummer2000,
  author    = {Kummer, Volker},
  title     = {Ein kurzer Einblick in die Vielfalt unserer heimischen Pilze II},
  year      = {2000},
  language  = {de}
}
@article{Kummer2005,
  author    = {Kummer, Volker},
  title     = {Ein Vorkommen von Draba muralis L. im Potsdamer Stadtgebiet},
  year      = {2005},
  language  = {de}
}
@article{Kummer2002,
  author    = {Kummer, Volker},
  title     = {Ein Vorkommen von Glyceria striata im Springbruch bei Potsdam},
  year      = {2002},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Eine botanische Wanderung rund um den Neuendorfer See},
  year      = {1997},
  language  = {de}
}
@article{Kummer2007,
  author    = {Kummer, Volker},
  title     = {Einige Aspekte der Pilzflora im Bol'soj Thac-Gebiet (NW-Kaukasus)},
  year      = {2007},
  abstract  = {Some aspects of the fungal flora in the Bol'{\"U}oj Tha; area (NW-Caucasus) - During an excursion to the Bol'soj Tha; area in north-western Caucasus in the late summer of 1998 a number of mycological observations were made. 111 macrofungi species (30 ascomycetes, 81 basidiomycetes), 16 myxomycetes and 42 phytoparasitic fungi (15 Erysiphales, 27 Uredinales) were registered. The majority of the recorded macromycetes were decomposers of dead stems and logs of different trees and shrubs, especially of the dominating tree species Fagus orientalis and Abies nordmanniana. Bondarzewia montana, Hericium alpestre and Phellinus hartigii are typical colonisers of old Abies trunks and therefore of special interest. They were recorded several times, especially in the primeval forests of the excursion area. Some of the collected taxa like Daldinia petriniae, Hypoxylon cercidicola, H. liviae, Ophiostoma polyporicola, Pezoloma marchantiae, Ramsbottomia macracantha, Symphyosyria angelicae, Auriporia aurulenta, Flagelloscypha pilatii, Hymenochaete carpatica, Marasmius cf. rhododendrorum and Pellidiscus pallidus are discussed in detail. Some of the recorded taxa are probably new for the western Caucasus and in some cases also for Russia.},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Einige interessante Neub{\"u}rger der Potsdamer Umgebung},
  year      = {1997},
  language  = {de}
}
@article{KummerJentsch1997,
  author    = {Kummer, Volker and Jentsch, Helmut},
  title     = {Elodea nuttallii (PLANCH.), St, Johan nun auch in Brandenburg},
  year      = {1997},
  language  = {de}
}
@article{AleAghaBolayBraunetal.2004,
  author    = {Ale-Agha, Nosratollah and Bolay, Adrien and Braun, Uwe and Jage, Horst and Kummer, Volker and Lebeda, Ales and Piatek, Marcin and Shin, Hyeon-Dong and Zimmermannova-Pastircakova, Katarina},
  title     = {Erysiphe catalpae and E. elevata in Europe},
  year      = {2004},
  language  = {en}
}
@article{BolayBraunDelheyetal.2005,
  author    = {Bolay, Adrien and Braun, Uwe and Delhey, Rolf and Kummer, Volker and Piatek, Marcin and Wolczanska, Agata},
  title     = {Erysiphe deutziae - a new epidemic spread in Europe},
  year      = {2005},
  abstract  = {Erysiphe deutziae (Bunkina) U. Braun \& S. Takam. is powdery mildew fungus that is currently spreading in Europe. The anamorph of this species has been found in France, Germany, Poland and Switzerland on Deutzia sp. (cult.), Deutzia x magnifica (Lemoine) Rehder and Deutzia scabra Thunb. The morphology, taxonomy and worldwide distribution of Erysiphe deutziae are described, illustrated and discussed},
  language  = {en}
}
@article{BolayBraunDelheyetal.2005,
  author    = {Bolay, Adrien and Braun, Uwe and Delhey, Rolf and Kummer, Volker and Piatek, Marcin and Wolczanska, Agata},
  title     = {Erysiphe deutziae : a new epidemic spread in Europe},
  year      = {2005},
  abstract  = {Erysiphe deutziae (Bunkina) U. Braun \& S. Takam. is powdery mildew fungus that is currently spreading in Europe. The anamorph of this species has been found in France, Germany, Poland and Switzerland on Deutzia sp. (cult.), Deutzia x magnifica (Lemoine) Rehder and Deutzia scabra Thunb. The morphology, taxonomy and worldwide distribution of Erysiphe deutziae are described, illustrated and discussed},
  language  = {en}
}
@article{KasparzKummer2003,
  author    = {Kasparz, Sven and Kummer, Volker},
  title     = {Exkursionsbericht "Exkursion zu den L{\"u}bbener Pfaffenbergen und Hartmannsdorfer Wiesen" am 20.07.2002},
  issn      = {0724-3111 -},
  year      = {2003},
  language  = {de}
}
@article{Kummer2001,
  author    = {Kummer, Volker},
  title     = {Exkursionsbericht "Exkursion zum S{\"u}dufer des Dolgener Sees und zum Schwarzen Luch bei Groß Leuthen" am 05.08.2000},
  year      = {2001},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Exkursionsbericht "Neuendorfer Se/Unterspreewald" am 31.08.1996},
  year      = {1996},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Farbenfroh und verg{\"a}nglich},
  year      = {1997},
  language  = {de}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Flora und Vegetation im Bereich des Neuendorfer Sees (Biosph{\"a}renreservat Spreewald)},
  year      = {1998},
  language  = {de}
}
@article{BurkartKummerFischer1995,
  author    = {Burkart, Michael and Kummer, Volker and Fischer, Wolfgang},
  title     = {Floristische Neu- und Wiederfunde im Gebiet der Unteren Havel},
  year      = {1995},
  language  = {de}
}
@article{JentschKummer1994,
  author    = {Jentsch, Helmut and Kummer, Volker},
  title     = {Floristische Neufunde aus dem Spreewald},
  year      = {1994},
  language  = {de}
}
@article{GrosseBrauckmannKummer2004,
  author    = {Grosse-Brauckmann, Helga and Kummer, Volker},
  title     = {F{\"u}nf bemerkenswerte Funde corticioider Pilze aus Deutschland},
  issn      = {0014-8962},
  year      = {2004},
  language  = {de}
}
@article{RottstockJoshiKummeretal.2014,
  author    = {Rottstock, Tanja and Joshi, Jasmin Radha and Kummer, Volker and Fischer, Markus},
  title     = {Higher plant diversity promotes higher diversity of fungal pathogens, while it decreases pathogen infection per plant},
  series = {Ecology : a publication of the Ecological Society of America},
  volume    = {95},
  journal   = {Ecology : a publication of the Ecological Society of America},
  number    = {7},
  publisher = {Wiley},
  address   = {Washington},
  issn      = {0012-9658},
  pages     = {1907 -- 1917},
  year      = {2014},
  abstract  = {Fungal plant pathogens are common in natural communities where they affect plant physiology, plant survival, and biomass production. Conversely, pathogen transmission and infection may be regulated by plant community characteristics such as plant species diversity and functional composition that favor pathogen diversity through increases in host diversity while simultaneously reducing pathogen infection via increased variability in host density and spatial heterogeneity. Therefore, a comprehensive understanding of multi-host multi-pathogen interactions is of high significance in the context of biodiversity-ecosystem functioning. We investigated the relationship between plant diversity and aboveground obligate parasitic fungal pathogen ("pathogens" hereafter) diversity and infection in grasslands of a long-term, large-scale, biodiversity experiment with varying plant species (1-60 species) and plant functional group diversity (1-4 groups). To estimate pathogen infection of the plant communities, we visually assessed pathogen-group presence (i.e., rusts, powdery mildews, downy mildews, smuts, and leaf-spot diseases) and overall infection levels (combining incidence and severity of each pathogen group) in 82 experimental plots on all aboveground organs of all plant species per plot during four surveys in 2006. Pathogen diversity, assessed as the cumulative number of pathogen groups on all plant species per plot, increased log-linearly with plant species diversity. However, pathogen incidence and severity, and hence overall infection, decreased with increasing plant species diversity. In addition, co-infection of plant individuals by two or more pathogen groups was less likely with increasing plant community diversity. We conclude that plant community diversity promotes pathogen-community diversity while at the same time reducing pathogen infection levels of plant individuals.},
  language  = {en}
}
@article{KuehlingKummer1999,
  author    = {K{\"u}hling, Matthias and Kummer, Volker},
  title     = {Im Land der Araukarier},
  year      = {1999},
  language  = {de}
}
@article{Kummer1997,
  author    = {Kummer, Volker},
  title     = {Kommt Plagiothecium undulatum (HEDW) B.S.G. noch in der Niederlausitz vor?},
  year      = {1997},
  language  = {de}
}
@article{Kummer2001,
  author    = {Kummer, Volker},
  title     = {Korrekturen und Erg{\"a}nzungen zur Pilzflora des Unteren Haveltales.-},
  year      = {2001},
  language  = {de}
}
@article{KummerJentsch2001,
  author    = {Kummer, Volker and Jentsch, Helmut},
  title     = {Korrekturen und Nachtr{\"a}ge als Vorarbeit zu einer Flora des Spreewaldes},
  year      = {2001},
  language  = {de}
}
@article{Kummer2007,
  author    = {Kummer, Volker},
  title     = {List of fungi (ascomycetes, basidiomycetes, myxomycetes and phytoparasitic fungi) recorded in the Bol'soj Thac area between the so called "Devils gate" (Acesbok) and the village Novoprohladnoe},
  year      = {2007},
  abstract  = {The list contains all the identified fungi collections of the excursion in 1998. In it were also included some records published by OTTO (2001) and few unpublished data of fungi mainly collected by V. Otte after 1998. Unless other information is given, all the fungal collections and their determination were done by the author. Most of the collections are integrated as exsiccata in the herbarium of the author.},
  language  = {en}
}
@article{RistowHerrmannIlligetal.2006,
  author    = {Ristow, Michael and Herrmann, Andreas and Illig, Hubert and Klemm, Gunther and Kummer, Volker and Kl{\"a}ge, Hans-Christian and Machatzi, Bernd and Raetzel, Stefan and Schwarz, R. and Zimmermann, Friedrich},
  title     = {Liste und Rote Liste der etablierten Gef{\"a}ßpflanzen Brandenburgs},
  year      = {2006},
  language  = {de}
}
@article{Kummer2002,
  author    = {Kummer, Volker},
  title     = {Literaturhinweis},
  year      = {2002},
  language  = {de}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Loweomyces fractipes im Unterspreewald gefunden},
  year      = {1998},
  language  = {de}
}
@article{AliRungeDutbayevetal.2016,
  author    = {Ali, Tahir and Runge, Fabian and Dutbayev, Ayan and Schmuker, Angelika and Solovyeva, Irina and Nigrelli, Lisa and Buch, Ann-Katrin and Xia, Xiaojuan and Ploch, Sebastian and Orren, Ouria and Kummer, Volker and Paule, Juraj and Celik, Ali and Vakhrusheva, Ljudmila and Gabrielyan, Ivan and Thines, Marco},
  title     = {Microthlaspi erraticum (Jord.) T. Ali et Thines has a wide distribution, ranging from the Alps to the Tien Shan},
  series = {Flora : morphology, distribution, functional ecology of plants},
  volume    = {225},
  journal   = {Flora : morphology, distribution, functional ecology of plants},
  publisher = {American Chemical Society},
  address   = {Jena},
  issn      = {0367-2530},
  doi       = {10.1016/j.flora.2016.09.008},
  pages     = {76 -- 81},
  year      = {2016},
  abstract  = {Microthlaspi is a predominantly Eurasian genus which also occurs in the northernmost parts of Africa (Maghreb). The most widespread species of the genus is M. perfoliatum, which can be found from Sweden to Algeria and from Portugal to China. The other species are thought to have much more confined distribution ranges, often covering only a few hundred kilometres. This is also believed for the diploid M. erraticum, which was recently re-appraised as a taxon independent from the tetra- to hexaploid M. perfoliatum. Previously, M. erraticum was believed to be present only in Central Europe, from the East of France to Slovenia. In order to gain a deeper understanding of the ecology, evolution and migration history of Microthlaspi it was the focus of the current study to investigate, if M. erraticum is present in habitats outside Central Europe, but with microclimates similar to Central Europe. It is demonstrated that M. erraticum is much more widespread than previously thought, while other lineages apart from M. perfoliatum s.str. and M. erraticum seem to have restricted distribution ranges. The latter species was observed from the Alps and their foreland, the Balkans, the mountainous areas around the Black Sea, Southern Siberia, as well as the Altai and Tien Shan mountains. This demonstrates a widespread occurrence of this easily-overlooked species. (C) 2016 Elsevier GmbH. All rights reserved.},
  language  = {en}
}
@article{ChoiKlostermanKummeretal.2015,
  author    = {Choi, Young-Joon and Klosterman, Steven J. and Kummer, Volker and Voglmayr, Hermann and Shin, Hyeon-Dong and Thines, Marco},
  title     = {Multi-locus tree and species tree approaches toward resolving a complex clade of downy mildews (Straminipila, Oomycota), including pathogens of beet and spinach},
  series = {Molecular phylogenetics and evolution},
  volume    = {86},
  journal   = {Molecular phylogenetics and evolution},
  publisher = {Elsevier},
  address   = {San Diego},
  issn      = {1055-7903},
  doi       = {10.1016/j.ympev.2015.03.003},
  pages     = {24 -- 34},
  year      = {2015},
  abstract  = {Accurate species determination of plant pathogens is a prerequisite for their control and quarantine, and further for assessing their potential threat to crops. The family Peronosporaceae (Straminipila; Oomycota) consists of obligate biotrophic pathogens that cause downy mildew disease on angiosperms, including a large number of cultivated plants. In the largest downy mildew genus Peronospora, a phylogenetically complex clade includes the economically important downy mildew pathogens of spinach and beet, as well as the type species of the genus Peronospora. To resolve this complex clade at the species level and to infer evolutionary relationships among them, we used multi-locus phylogenetic analysis and species tree estimation. Both approaches discriminated all nine currently accepted species and revealed four previously unrecognized lineages, which are specific to a host genus or species. This is in line with a narrow species concept, i.e. that a downy mildew species is associated with only a particular host plant genus or species. Instead of applying the dubious name Peronospora farinosa, which has been proposed for formal rejection, our results provide strong evidence that Peronospora schachtii is an independent species from lineages on Atriplex and apparently occurs exclusively on Beta vulgaris. The members of the clade investigated, the Peronospora rumicis clade, associate with three different host plant families, Amaranthaceae, Caryophyllaceae, and Polygonaceae, suggesting that they may have speciated following at least two recent inter-family host shifts, rather than contemporary cospeciation with the host plants. (C) 2015 Elsevier Inc. All rights reserved.},
  language  = {en}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Neue Erkenntnisse {\"u}ber den Ursprung der Krausnicker Kirche und ihre Einordnung in die damalige Kirchenbauentwicklung},
  year      = {1998},
  language  = {de}
}
@article{JageKlenkeKummer2010,
  author    = {Jage, Horst and Klenke, F. and Kummer, Volker},
  title     = {Neufunde und bemerkenswerte Best{\"a}tigungen von phytoparasitischen Kleinpilzen in Deutschland - Teil 1 : Erysiphales (Echte Mehltaupilze)},
  issn      = {1436-2317},
  year      = {2010},
  abstract  = {Members of the Erysiphales are conspicuous phytoparasitic microfungi during the late summer and autumn period. A lot of literature sources were evaluated by BRANDENBURGER \& HAGEDORN (2006). They give an overview of the floristic data of the separate Erysiphales-host-combinations in the individual federal states of Germany. Unfortunately, most of the articles published after 2000 and especially many unpublished data assembled since 1970s have not been included. Therefore the present list is a supplementa-tion to BRANDENBURGER \& HAGEDORN (2006). A total of 1.994 new records of Erysiphales-host-combinations from all federal states of Germany the Saarland excluded have been listed. Most of them are from Brandenburg, Saxony and Saxony-Anhalt. In contrast to that obvious deficits clearly exist in the federal states of Bremen, Hamburg, Hessen and Mecklenburg-Western Pomerania. Compared to BRANDENBURGER \& HAGEDORN (2006) only the first record of the respective Erysiphales-host-combination in the particular federal states of Germany is given. If the last record of an Erysiphales-host-combination is older than 25 years in some cases a new record is also listed. Since 2000 17 Erysiphales taxa have been collected in Germany for the first time. All in all 97 matrices novae especially different cultivated plants are compiled. 49 resp. 59 fungus-host-combinations are new for Europe and Central Europe and furthermore 199 combinations are new for Germany. 54 records are the first exact data for the occurrence of the fungus- host-combination in Germany. These combinations have been listed globally in the literature for Germany until today but without any exact data. A part of the given records offer double infections with other phytoparasitic micro-fungi. These infections have been represented summarily. A list of fungus-host-combinations published in the literature but not clearly recorded for Germany is given.},
  language  = {de}
}
@article{Kummer1993,
  author    = {Kummer, Volker},
  title     = {Notizen zu einem Vorkommen des Roten Waldv{\"o}geleins bei Falkensee},
  year      = {1993},
  language  = {de}
}
@article{Kummer2000,
  author    = {Kummer, Volker},
  title     = {Notizen zur Pilzflora des L{\"u}bbener " Hains"},
  year      = {2000},
  language  = {de}
}
@article{Kummer1993,
  author    = {Kummer, Volker},
  title     = {Notizen {\"u}ber den Amtsgarten zu Krausnick},
  year      = {1993},
  language  = {de}
}
@article{Kummer1994,
  author    = {Kummer, Volker},
  title     = {Notizen {\"u}ber einige Adventivpflanzenfunde auf dem Krausnicker M{\"u}llplatz},
  year      = {1994},
  language  = {de}
}
@article{KummerHaneltHaneltetal.2010,
  author    = {Kummer, Volker and Hanelt, Dorothea and Hanelt, Peter and Jage, Horst and John, Heino and Richter, Heidrun and Richter, Udo and Schultz, Burkhard},
  title     = {Phyllactinia hippopha{\"e}s (Erysiphales) rediscovered in Germany},
  issn      = {1641-8180},
  year      = {2010},
  abstract  = {The Erysiphales species Phyllactinia hippopha{\"e}s Thuem. ex S. Blumer was found for the fi rst time on cultivated Sea Buckthorn (Hippopha{\"e} rhamnoides L.) near Großkayna (Saxony-Anhalt) in October 2009. This fungus was considered to be extinct in Germany. Intensive searching in Saxony-Anhalt and the Potsdam area (Brandenburg) yielded many additional records, most of them from former brown coal mining areas or in Sea Buckthorn plantations.},
  language  = {en}
}
@article{RottstockKummerFischeretal.2017,
  author    = {Rottstock, Tanja and Kummer, Volker and Fischer, Markus and Joshi, Jasmin Radha},
  title     = {Rapid transgenerational effects in Knautia arvensis in response to plant community diversity},
  series = {The journal of ecology},
  volume    = {105},
  journal   = {The journal of ecology},
  publisher = {Wiley},
  address   = {Hoboken},
  issn      = {0022-0477},
  doi       = {10.1111/1365-2745.12689},
  pages     = {714 -- 725},
  year      = {2017},
  abstract  = {1. Plant species persistence in natural communities requires coping with biotic and abiotic challenges. These challenges also depend on plant community composition and diversity. Over time, biodiversity effects have been shown to be strengthened via increasing species complementarity in mixtures. Little is known, however, whether differences in community diversity and composition induce rapid transgenerational phenotypic adaptive differentiation during community assembly. We expect altered plant-plant and other biotic interactions (mutualists or antagonists) in high vs. low diverse communities to affect immediate within-and between-species trait differentiations due to competition for light and nutrients. 2. Three years after the initiation of a large-scale, long-term biodiversity experiment in Jena, Germany, we tested for effects of varying experimental plant community diversity (1-60 plant species; one to four plant functional groups) and composition (with or without legumes and/or grasses) on phenotypic differentiation and variation of the tall herb Knautia arvensis. We measured reproduction at different diversity levels in the Jena Experiment (residents hereafter) and, in an additional common garden experiment without competition, recorded subsequent offspring performance (i.e. growth, reproductive success and susceptibility to powdery mildew) to test for differentiation in phenotypic expression and variability. 3. We observed phenotypic differences among diversity levels with reduced fecundity of K. arvensis residents in more diverse communities. In the next generation grown under common garden conditions, offspring from high-diversity plots showed reduced growth (i.e. height) and lower reproduction (i.e. fewer infructescences), but increased phenotypic trait variability (e.g. in leaf width and powdery mildew presence) and also tended to be less susceptible to powdery mildew infection. 4. Community composition also affected Knautia parents and offspring. In the presence of legumes, resident plants produced more seeds (increased fecundity); however, germination rate of those seeds was reduced at an early seedling stage (reduced fertility). 5. Synthesis. We conclude that rapid transgenerational effects of community diversity and composition on both mean and variation of phenotypic traits among offspring exist. In addition to heritable variation, environmentally induced epigenetic and/or maternal processes matter for early plant community assembly and may also determine future species coexistence and community stability.},
  language  = {en}
}
@article{GoergPlochKruseetal.2017,
  author    = {Goerg, Marlena and Ploch, Sebastian and Kruse, Julia and Kummer, Volker and Runge, Fabian and Choi, Young-Joon and Thines, Marco},
  title     = {Revision of Plasmopara (Oomycota, Peronosporales) parasitic to Impatiens},
  series = {Mycological progress : international journal of the German Mycological Society},
  volume    = {16},
  journal   = {Mycological progress : international journal of the German Mycological Society},
  publisher = {Springer},
  address   = {Heidelberg},
  issn      = {1617-416X},
  doi       = {10.1007/s11557-017-1316-y},
  pages     = {791 -- 799},
  year      = {2017},
  abstract  = {The oomycete Plasmopara obducens was first described on wild Impatiens noli-tangere in Germany in 1877. About 125 years later the first occurrence of P. obducens on cultivated I. walleriana in the United Kingdom was reported, and a worldwide epidemic followed. Although this pathogen is a major threat for ornamental busy lizzy, the identity of the pathogen remained unconfirmed and the high host specificity observed for the genus Plasmopara cast doubts regarding its determination as P. obducens. In this study, using multigene phylogenies and morphological investigation, it is revealed that P. obducens on I. noli-tangere is not the conspecific with the pathogen affecting I. walleriana and another ornamental balsam, I. balsamina. As a consequence, the new names P. destructor and P. velutina are introduced for the pathogens of I. walleriana and I. balsamina, respectively.},
  language  = {en}
}
@article{Kummer2002,
  author    = {Kummer, Volker},
  title     = {Rutstroemia fruticeti und Velutarina rufoolivacea : zwei wenig beachtete Besiedler abgestorbener Rubus fruticosus-Ruten},
  issn      = {0014-8962},
  year      = {2002},
  language  = {de}
}
@article{BaralRoenschRichteretal.2022,
  author    = {Baral, Hans Otto and R{\"o}nsch, Peter and Richter, Udo and Urban, Alexander and Kruse, Julia and Bemmann, Martin and Kummer, Volker and Javier Valencia, Francisco and Huth, Wolfgang},
  title     = {Schroeteria decaisneana, S. poeltii, and Ciboria ploettneriana (Sclerotiniaceae, Helotiales, Ascomycota), three parasites on Veronica seeds},
  series = {Mycological progress : international journal of the German Mycological Society},
  volume    = {21},
  journal   = {Mycological progress : international journal of the German Mycological Society},
  number    = {1},
  publisher = {Springer},
  address   = {Berlin ; Heidelberg},
  issn      = {1617-416X},
  doi       = {10.1007/s11557-021-01742-4},
  pages     = {359 -- 407},
  year      = {2022},
  abstract  = {Ciboria ploettneriana, Schroeteria decaisneana, and S. poeltii produce morphologically very similar apothecia emerging from fallen stromatized seeds of Veronica spp., the former two on V. hederifolia agg. in temperate central Europe and S. poeltii on V. cymbalaria in mediterranean southern Europe. They are described and illustrated in detail based on fresh collections or moist chamber cultures of infected seeds. A key is provided to differentiate the three species from their teleomorphs. For the first time, connections between two teleomorphs and two Schroeteria anamorphs are reported. Members of the anamorph-typified genus Schroeteria are known as host-specific plant parasites that infect seeds of different Veronica spp. In earlier times, they were classified in the Ustilaginales (Basidiomycota), but since more than 30 years, they are referred to as false smut fungi producing smut-like chlamydospores, based on light microscopic and ultrastructural studies which referred them to the Sclerotiniaceae (Helotiales). During the present study, rDNA sequences were obtained for the first time from chlamydospores of Schroeteria bornmuelleri (on V. rubrifolia), S. decaisneana (on V. hederifolia), S. delastrina (generic type, on V. arvensis), and S. poeltii (on V. cymbalaria) and from apothecia of C. ploettneriana, S. decaisneana, and S. poeltii. As a result, the anamorph-teleomorph connection could be established for S. decaisneana and S. poeltii by a 100\% ITS similarity, whereas C. ploettneriana could not be connected to a smut-like anamorph. Ciboria ploettneriana in the here-redefined sense clustered in our combined phylogenetic analyses of ITS and LSU in relationship of Sclerotinia s.l., Botrytis, and Myriosclerotinia rather than Ciboria, but its placement was not supported. Its affiliation in Ciboria was retained until a better solution is found. Also Schroeteria poeltii clustered unresolved in this relationship but with a much higher molecular distance. The remaining three Schroeteria spp. formed a strongly supported monophyletic group, here referred to as "Schroeteria core clade", which clustered with medium to high support as a sister clade of Monilinia jezoensis, a member of the Monilinia alpina group of section Disjunctoriae. We observed ITS distances of 5-6.3\% among members of the Schroeteria core clade, but 13.8-14.7\% between this clade and S. poeltii, which appears to be correlated with the deviating chlamydospore morphology of S. poeltii. Despite its apparent paraphyly, Schroeteria is accepted here in a wide sense as a genus distinct from Monilinia, particularly because of its very special anamorphs. A comparable heterogeneity in rDNA analyses was observed in Monilinia and other genera of Sclerotiniaceae. Such apparent heterogeneity should be met with skepticism, however, because the inclusion of protein-coding genes in phylogenetic analyses resulted in a monophyletic genus Monilinia. More sclerotiniaceous taxa should be analysed for protein-coding genes in the future, including Schroeteria. Four syntype specimens of Ciboria ploettneriana in B were reexamined in the present study, revealing a mixture of the two species growing on V. hederifolia agg. Based on its larger ascospores in comparison with S. decaisneana, a lectotype is proposed for C. ploettneriana.},
  language  = {en}
}
@article{KummerBurkart1995,
  author    = {Kummer, Volker and Burkart, Michael},
  title     = {Scolochloa festucacea (WILLD.) LINK in der Unteren Havelniederung Sachsen-Anhalts},
  year      = {1995},
  language  = {de}
}
@article{BubnerBuchheitFriedrichetal.2019,
  author    = {Bubner, Ben and Buchheit, Ramona and Friedrich, Frank and Kummer, Volker and Scholler, Markus},
  title     = {Species identification of European forest pathogens of the genus Milesina (Pucciniales) using urediniospore morphology and molecular barcoding including M. woodwardiana sp. nov.},
  series = {MycoKeys},
  journal   = {MycoKeys},
  number    = {48},
  publisher = {Pensoft Publishers},
  address   = {Sofia},
  issn      = {1314-4057},
  doi       = {10.3897/mycokeys.48.30350},
  pages     = {1 -- 40},
  year      = {2019},
  abstract  = {Species of rust fungi of the genus Milesina (Pucciiastraceae, Pucciniales) are distributed mainly in northern temperate regions. They host-alternate between needles of fir (Abies spp.) and fronds of ferns (species of Polypodiales). Milesina species are distinguished based on host taxonomy and urediniospore morphology. In this study, 12 species of Milesina from Europe were revised. Specimens were examined by light and scanning electron microscopy for urediniospore morphology with a focus on visualising germ pores (number, size and position) and echinulation. In addition, barcode loci (ITS, nad6, 28S) were used for species delimitation and for molecular phylogenetic analyses. Barcodes of 72 Milesina specimens were provided, including 11 of the 12 species. Whereas urediniospore morphology features were sufficient to distinguish all 12 Milesina species except for 2 (M. blechni and M. kriegeriana), ITS sequences separated only 4 of 11 species. Sequencing with 28S and nad6 did not improve species resolution. Phylogenetic analysis, however, revealed four phylogenetic groups within Milesina that also correlate with specific urediniospore characters (germ pore number and position and echinulation). These groups are proposed as new sections within Milesina (sections Milesina, Vogesiacae M. Scholler \& Bubner, sect. nov., Scolopendriorum M. Scholler \& Bubner, sect. nov. and Carpaticae M. Scholler \& Bubner, sect. nov.). In addition, Milesina woodwardiana Buchheit \& M. Scholler, sp. nov. on Woodwardia radicans, a member of the type section Milesina, is newly described. An identification key for European Milesina species, based on urediniospore features, is provided.},
  language  = {en}
}
@article{BraunKummerXu2009,
  author    = {Braun, Uwe and Kummer, Volker and Xu, B.},
  title     = {Taxonomy and nomenclature of powdery mildew fungi : erysiphe asclepiadis, E. robiniicola and Golovinomyces caulicola},
  year      = {2009},
  abstract  = {The new species Erysiphe asclepiadis is described, illustrated and discussed. A new Chinese collection of Erysiphe robiniicola has recently been found that can be used to elucidate and discuss the confused taxonomy and nomenclature of this species and other taxa of Erysiphe s. lat. on Robinia spp. Based on a re-examination of type material in connection with the data given in the protologue, it can be shown that Capnodium lygodesmiae must be reduced to synonymy with Ampelomyces quisqualis. The confusion surrounding the name C. lygodesmiae, caused by the occurrence of the hyperparasite A. quisqualis on a powdery mildew fungus with abundant chasmothecia, is discussed in detail. The new combination, Golovinomyces caulicola (; Spolverinia caulicola), is proposed for the powdery mildew that serves as host of C. lygodesmiae.},
  language  = {en}
}
@article{KruseKummerShivasetal.2018,
  author    = {Kruse, Julia and Kummer, Volker and Shivas, Roger G. and Thines, Marco},
  title     = {The first smut fungus, Thecaphora anthemidis sp nov (Glomosporiaceae), described from Anthemis (Asteraceae)},
  series = {MycoKeys},
  journal   = {MycoKeys},
  number    = {41},
  publisher = {Pensoft Publ.},
  address   = {Sofia},
  issn      = {1314-4057},
  doi       = {10.3897/mycokeys.41.28454},
  pages     = {39 -- 50},
  year      = {2018},
  abstract  = {There are 63 known species of Thecaphora (Glomosporiaceae, Ustilaginomycotina), a third of which occur on Asteraceae. These smut fungi produce yellowish-brown to reddish-brown masses of spore balls in specific, mostly regenerative, plant organs. A species of Thecaphora was collected in the flower heads of Anthemis chia (Anthemideae, Asteraceae) on Rhodes Island, Greece, in 2015 and 2017, which represents the first smut record of a smut fungus on a host plant species in this tribe. Based on its distinctive morphology, host species and genetic divergence, this species is described as Thecaphora anthemidis sp. nov. Molecular barcodes of the ITS region are provided for this and several other species of Thecaphora. A phylogenetic and morphological comparison to closely related species showed that Th. anthemidis differed from other species of Thecaphora. Thecaphora anthemidis produced loose spore balls in the flower heads and peduncles of Anthemis chia unlike other flower-infecting species.},
  language  = {en}
}
@article{WoltersBittmannKummer2005,
  author    = {Wolters, Steffen and Bittmann, Felix and Kummer, Volker},
  title     = {The first subfossil records of Urtica kioviensis Rogow. and their consequences for palaeoecological interpretations},
  year      = {2005},
  abstract  = {Among plant remains from Mesolithic layers dating from 9249 to 7779 B.C. at the excavation site of Friesack IV in north-eastern Germany, nutlets of Urtica kioviensis were identified. Morphological studies have shown that they clearly differed from all other European Urtica species investigated. In contrast, pollen morphological investigations revealed only slight differences between the central European Urtica species, which could hardly have been noticed during routine or normal pollen analyses. The records of U. kioviensis nutlets are the first subfossil finds reported and prove the indigenous status of this taxon in north-eastern Germany. The records are discussed in the context of the overall species spectrum of the Mesolithic layers and consequences for the interpretation of pollen analytical studies concerning human impact are pointed out},
  language  = {en}
}
@article{KummerLehnhardtKlopfer1992,
  author    = {Kummer, Volker and Lehnhardt, Lothar and Klopfer, Klaus},
  title     = {Untersuchungen zur Fremdbesatzproblematik bei 5 Gerstensorten mittels {\"A}hrennachkommenschaftspr{\"u}fung und Hordeinelektrophorese},
  year      = {1992},
  language  = {de}
}
@article{KummerKlopfer1992,
  author    = {Kummer, Volker and Klopfer, Klaus},
  title     = {Untersuchungen zur morphologischen Differenzierung von 5 nahe verwandten Sommergerstensorten},
  year      = {1992},
  language  = {de}
}
@article{Kummer1995,
  author    = {Kummer, Volker},
  title     = {Usnea filipendula : ein bemerkenswerter Flechtenfund bei Krausnick},
  year      = {1995},
  language  = {de}
}
@article{Kummer1993,
  author    = {Kummer, Volker},
  title     = {Vielstengeliges Sumpfried (Eleocharis multicaulis) am Luchsee gefunden},
  year      = {1993},
  language  = {de}
}
@article{Kummer2004,
  author    = {Kummer, Volker},
  title     = {Vom Seidenbau in Krausnick},
  year      = {2004},
  language  = {de}
}
@article{Kummer1999,
  author    = {Kummer, Volker},
  title     = {Von Anemone bis Zimbelkraut},
  year      = {1999},
  language  = {de}
}
@article{Kummer2001,
  author    = {Kummer, Volker},
  title     = {Vor 125 Jahren tagte der Botanische Verein der Provinz Brandenburg in L{\"u}bben},
  year      = {2001},
  language  = {de}
}
@article{KummerRichterSchwik2005,
  author    = {Kummer, Volker and Richter, Torsten and Schwik, J{\"u}rgen},
  title     = {Wegelina grumsiniana comb. nov. (Ascomycetes, Calosphaeriales) : ein Pyrenomycet auf der Porenschicht faulender Zunderschw{\"a}mme (Fomes fomentarius)},
  year      = {2005},
  language  = {de}
}
@article{Kummer1993,
  author    = {Kummer, Volker},
  title     = {Zum Vorkommen des Sternst{\"a}ublings (Mycenastrum corium) in der Niederlausitz},
  year      = {1993},
  language  = {de}
}
@article{Kummer1998,
  author    = {Kummer, Volker},
  title     = {Zum Vorkommen im Cetraria islandica (.L) ACH., dem isl{\"a}ndischen Moos, und Cetraria ericetorium OPIZ in Brandenburg unter besonderer Ber{\"u}cksichtigung der Niederlausitz},
  year      = {1998},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Zum Vorkommen von Asplenium viride HUDS : in Berlin und Brandenburg},
  year      = {1996},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Zur Pilzflora des Kienbergs bei Wolsier mit Hinweisen auf die Phanerogamenflora},
  year      = {1996},
  language  = {de}
}
@article{FischerKummerPoetsch1994,
  author    = {Fischer, Wolfgang and Kummer, Volker and P{\"o}tsch, Joachim},
  title     = {Zur Vegetation des Feuchtgebietes Internationaler Bedeutung (FIB) Untere Havel},
  year      = {1994},
  language  = {de}
}
@article{FischerKummer1994,
  author    = {Fischer, Wolfgang and Kummer, Volker},
  title     = {Zur Verbreitung und Soziologie von S colochloa festucacea L : in Nordostdeutschland und seine Unterscheidung von {\"a}hnlichen Gr{\"a}sern nach vegetativen Merkmalen},
  year      = {1994},
  language  = {de}
}
@article{Kummer1996,
  author    = {Kummer, Volker},
  title     = {Zur Wasserpflanzenvegetation des Neuendorfer Sees},
  year      = {1996},
  language  = {de}
}
@article{Kummer2005,
  author    = {Kummer, Volker},
  title     = {Zusammenstellung lokaler Pilzliteratur 2000 - 2003},
  year      = {2005},
  language  = {de}
}
@article{Kummer2010,
  author    = {Kummer, Volker},
  title     = {Zusammenstellung lokaler Pilzliteratur 2004 - 2008},
  issn      = {0232-4598},
  year      = {2010},
  language  = {de}
}