Occurrence and distribution of kumaun himalayan aquatic hyphomycetes: tetracladium

Six species of aquatic hyphomycetes belonging to the genus Tetracladium (T. marchalianum, T. setigerum, T. nainitalense, T. apiense, T. breve, and T. maxilliforme) isolated from submerged leaf litter as well as roots of various riparian plants of Nainital, Kumaun Himalaya (India) are described. Former two species are found common in occurrence while latter three species are rare in occurrence. Except T. maxilliforme, all the species were also recovered as root endophyte. A detail taxonomic description, occurrence and worldwide distribution of each Kumaun Himalayan species of Tetracladium along with a simplified key is also provided.