Freshwater Dothideomycetes
Authors: Dong Wei , Wang Bin , Hyde Kevin D. , McKenzie Eric H. C. , Raja Huzefa A. , Tanaka Kazuaki , Abdel-Wahab Mohamed A. , Abdel-Aziz Faten A. , Doilom Mingkwan , Phookamsak Rungtiwa , Hongsanan Sinang , Wanasinghe Dhanushka N. , Yu Xian-Dong , Wang Gen-Nuo , Yang Hao , Yang Jing , Thambugala Kasun M. , Tian Qing , Luo Zong-Long , Yang Jian-Bo , Miller Andrew N. , Fournier Jacques , Boonmee Saranyaphat , Hu Dian-Ming , Nalumpang Sarunya , Zhang Huang 
Published: December 2020

Freshwater Dothideomycetes are a highly diverse group of fungi, which are mostly saprobic in freshwater habitats worldwide. They are important decomposers of submerged woody debris and leaves in water. In this paper, we outline the genera of freshwater Dothideomycetes with notes and keys to species. Based on multigene analyses and morphology, we introduce nine new genera,viz.Aquimassariosphaeria,Aquatospora,Aquihelicascus,Fusiformiseptata,Neohelicascus,Neojahnula,Pseudojahnula,Purpureofaciens,Submersispora; 33 new species,viz.Acrocalymma bipolare,Aquimassariosphaeria kunmingensis,Aquatospora cylindrica,Aquihelicascus songkhlaensis,A. yunnanensis,Ascagilis submersa,A. thailandensis,Bambusicola aquatica,Caryospora submersa,Dictyocheirospora thailandica,Fusiformiseptata crocea,Helicosporium thailandense,Hongkongmyces aquaticus,Lentistoma aquaticum,Lentithecium kunmingense,Lindgomyces aquaticus,Longipedicellata aquatica,Neohelicascus submersus,Neohelicomyces dehongensis,N. thailandicus,Neohelicosporium submersum,Nigrograna aquatica,Occultibambusa kunmingensis,Parabambusicola aquatica,Pseudoasteromassaria aquatica,Pseudoastrosphaeriella aquatica,Pseudoxylomyces aquaticus,Purpureofaciens aquatica,Roussoella aquatica,Shrungabeeja aquatica,Submersispora variabilis,Tetraploa puzheheiensis,T. yunnanensis; 16 new combinations, viz.Aquimassariosphaeria typhicola,Aquihelicascus thalassioideus,Ascagilis guttulaspora,A. queenslandica,A. seychellensis,A. sunyatsenii,Ernakulamia xishuangbannaensis,Neohelicascus aquaticus,N. chiangraiensis,N. egyptiacus,N. elaterascus,N. gallicus,N. unilocularis,N. uniseptatus,Neojahnula australiensis,Pseudojahnula potamophila; 17 new geographical and habitat records, viz.Aliquandostipite khaoyaiensis,Aquastroma magniostiolata,Caryospora aquatica,C. quercus,Dendryphiella vinosa,Ernakulamia cochinensis,Fissuroma neoaggregatum,Helicotruncatum palmigenum,Jahnula rostrata,Neoroussoella bambusae,N. leucaenae,Occultibambusa pustula,Paramonodictys solitarius,Pleopunctum pseudoellipsoideum,Pseudocapulatispora longiappendiculata,Seriascoma didymosporum,Shrungabeeja vadirajensisand ten new collections from China and Thailand, viz.Amniculicola guttulata,Aquaphila albicans,Berkleasmium latisporum,Clohesyomyces aquaticus,Dictyocheirospora rotunda,Flabellascoma fusiforme,Pseudoastrosphaeriella bambusae,Pseudoxylomyces elegans,Tubeufia aquaticaandT. cylindrothecia.Dendryphiella phitsanulokensisandTubeufia roseohelicosporaare synonymized withD. vinosaandT. tectonae, respectively. Six orders, 43 families and 145 genera which belong to freshwater Dothideomycetes are reviewed. Of these, 46 genera occur exclusively in freshwater habitats. A world map illustrates the distribution of freshwater Dothideomycetes.