Abstract
The investigation of freshwater fungal diversity in Guangxi Province, China, reveals an interesting ascomycetous species. The morphological and phylogenetic analyses incorporating combined LSU, SSU, ITS and tef1-α sequence data have identified it as a novel species within Setoseptoria, namely S. guangxiensis. Setoseptoria guangxiensis is distinct within the genus by its uni-loculate ascomata, which have a prominent papilla and lack a clypeus-like structure, as well as 1-septate ascospores that are surrounded by a defined gelatinous sheath. In addition, Setoseptoria baiyunensis nom. nov. is proposed for a collection MHZU 22-0133 as the previous name “Setoseptoria bambusae” is invalidly published. A key to the sexual morph of species within Setoseptoria is provided.
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