Abstract
Freshwater fungi exhibit a remarkable diversity and are commonly found on submerged wood, freshwater insects, herbaceous materials, sediments, leaves, foam, and living plants. Sordariomycetes in the Ascomycota is the most frequently reported group in freshwater environments. Three samples of submerged decaying wood and twigs samples were collected and examined during in this study from freshwater habitats in Yunnan and Sichuan provinces in China. Detailed morphological studies, complemented by phylogenetic analyses based on ITS, LSU, SSU, RPB2 and TEF1‐α sequence data, revealed them to be three hitherto known species, namely Acrogenospora thailandica , Cancellidium cinereum and Chloridium humicola . Of these, Acrogenospora thailandica is a new geographical record for China. Chloridium humicola is also reported for the first time in China which enhances the geographical and host distribution of this species, providing new insights into its ecological preferences. Cancellidium cinereum is reported as an additional provincial record from China, contributing to our knowledge of its regional distribution. All three species, reported in their asexual state, are illustrated with detailed morphological descriptions and phylogenetic analyses. In addition, we also provide a new host record of the saprobic species Isthmolongispora quadricellularia in hyphomycetous asexual state on decaying wood for the first time in a terrestrial habitat.