| Summary: | Freshwater hyphomycetes are a highly diverse group of fungi with a worldwide distribution and have been mostly reported from tropical and subtropical regions. During investigations of freshwater fungi from the Greater Mekong subregion in China and Thailand, sixteen freshwater hyphomycetes (three of them belong to the class Dothideomycetes while thirteen belong to the class Sordariomycetes) were collected. Based on morphology and multi-gene phylogenetic analyses, <i>Neospadicoides thailandica</i>, <i>Pseudodactylaria aquatica</i>, <i>Sporidesmium nujiangense</i>, <i>Tetraploa thailandica</i>, <i>Vamsapriya</i><i>aquatica</i> and <i>Wongia fusiformis</i> are described as new species; <i>Aquapteridospora bambusinum</i> is proposed as a new combination; <i>Acrodictys liputii</i>, <i>Chloridium gonytrichii</i>, <i>Pseudoberkleasmium chiangmaiense</i>, <i>Pleomonodictys capensis</i>, <i>Sporidesmium aturbinatum</i> and <i>Vamsapriya indica</i> are reported as new country records; and <i>Sporidesmium tropicale</i>, <i>Sporoschisma chiangraiense</i> and <i>Sporoschisma longicatenatum</i> are introduced as three new collections. In addition, a checklist of freshwater fungi from China over the last five years is also provided.
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