Abstract
Pleurotheciaceae is a genera-rich and highly diverse family of fungi with a worldwide distribution in aquatic and terrestrial habitats. During the investigation of lignicolous freshwater fungi from karst landscapes in Yunnan Province, China, 15 fresh strains were obtained from submerged decaying wood. Based on the morphology and phylogenetic analysis of a combined LSU, ITS, SSU, and rpb2 sequence dataset, Obliquifusoideum triseptatum, Phaeoisaria obovata, Pleurotheciella brachyspora, Pl. longidenticulata, and Pl. obliqua were introduced as new species, P. synnematica and Rhexoacrodictys melanospora were reported as new habitat records, and P. sedimenticola and Pl. hyalospora were reported as new collections. In addition, based on morphological comparisons and phylogenetic analysis, we accepted Obliquifusoideum into in the family Pleurotheciaceae (Pleurotheciales, Savoryellomycetidae). Freshwater habitats are the primary habitats of Pleurotheciaceae species, and Yunnan Province has the highest concentration and species diversity of Pleurotheciaceae in China.
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