Diversity of Distoseptispora (Distoseptisporaceae) taxa on submerged decaying wood from the Red River in Yunnan, China.

The Red River Basin is located in the Indo-Burma biodiversity hotspot and is rich in lignicolous freshwater fungi, but no systematic research has been conducted. A systematic study on the species diversity of lignicolous freshwater fungi in the basin is ongoing. Seven distoseptispora-like specimens were collected from the Red River Basin in Yunnan. Phylogenetic analysis of ITS, LSU, tef 1-α, and rpb 2 genes and combined morphological data indicate that there are six distinct species of Distoseptispora , including two new species and four known species. Two new species were named D.suae and D.xinpingensis , and the four known species were D.bambusae , D.euseptata , D.obpyriformis and D.pachyconidia . This study provides detailed descriptions and illustrations of these six species and an updated phylogenetic backbone tree of Distoseptispora .