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During the investigation of lignicolous freshwater fungi in the Tibetan Plateau habitat, fifteen collections were isolated from submerged decaying wood. Fungal characteristics are commonly found as punctiform or powdery colonies with dark pigmented and muriform conidia. Multigene phylogenetic analyses of combined ITS, LSU, SSU and <i>TEF</i> DNA sequences showed that they belong to three families in Pleosporales. Among them, <i>Paramonodictys dispersa</i>, <i>Pleopunctum megalosporum</i>, <i>Pl. multicellularum</i> and <i>Pl. rotundatum</i> are established as new species. <i>Paradictyoarthrinium hydei</i>, <i>Pleopunctum ellipsoideum</i> and <i>Pl. pseudoellipsoideum</i> are reported as new records on the freshwater habitats in Tibetan Plateau, China. The morphological descriptions and illustrations of the new collections are provided.