Two novel species and two new records of Distoseptispora from freshwater habitats in China and Thailand

Abstract

During investigations into freshwater fungi from the Great Mekong Subregion, four Distoseptispora taxa were collected from China and Thailand. Based on morphological characteristics, and phylogenetic analyses of combined LSU, ITS, SSU, TEF1-α, and RPB2 sequence data, two new species Distoseptispora bangkokensis and D. lancangjiangensis are introduced, and two known species D. clematidis and D. thysanolaenae were first reported in freshwater habitat. Illustrations and descriptions of these taxa are provided, along with comparisons with extant taxa in the genus.

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

“…Although our collection differs significantly in conidia size from the original description of D. obpyriformis ( Luo et al 2018a ), multigene sequence data do not support this collection as a separate species. Similar results have been reported in previous studies and were found in several species in this study ( Yang et al 2018 ; Shen et al 2021 ; Ma et al 2022 ). Therefore, a new additional record of D. obpyriformis is reported from the Red River Basin in Yunnan, China.…”

“…Pairwise comparison of ITS , LSU , tef 1-α and rpb 2 sequences show negligible base pair differences. As previously reported, the conidia size and color of our new collection HKAS 125824 are significantly different from those originally described for D. pachyconidia (137–246 µm vs. 42–136 µm; pale brown to brown vs. pale-brown with a green tinge), as well as the number of conidial septa (14–45-distoseptate vs. 8–21-distoseptate) ( Yang et al 2018 ; Shen et al 2021 ; Ma et al 2022 ). Our new collection is also slightly different from the collection described by Ma et al (2022) , especially the number of conidial septa (14–45-distoseptate vs. up to 38-distoseptate) ( Ma et al 2022 ).…”

“…New collection, KUNCC 22–12477, is morphologically similar to the type species in having obclavate, guttulate, euseptate conidia ( Li et al 2021 ). Although the conidia size and color of D. euseptata KUNCC 22–12477 are slightly different from the type species, and conidia size is also an important basis for distinguishing Distoseptispora species, some previous studies in this genus found significant differences in conidial size between different collections of the same species ( Yang et al 2018 ; Shen et al 2021 ; Ma et al 2022 ). Based on the currently limited morphological and molecular sequence data, we treat the new collection, KUNCC 22–12477, as D. euseptata , which was first discovered in the Red River Basin in Yunnan, China.…”

“…Among them, D. hyalina and D. licualae are the only two teleomorph taxa in Distoseptispora ( Yang et al 2021 ; Konta et al 2023 ). Members of Distoseptispora are primarily saprophytes found on woody substrates from freshwater habitats (45 species), predominantly in China and Thailand and some also have been found in terrestrial habitats (23 species); D. bambusae , D. clematidis , D. tectonae , D. thysanolaenae and D. xishuangbannaensis have been reported in both freshwater and terrestrial habitats ( Hyde et al 2016 ; Luo et al 2018a , 2019 ; Yang et al 2018 , 2021 ; Monkai et al 2020 ; Phukhamsakda et al 2020 ; Sun et al 2020 ; Dong et al 2021 ; Li et al 2021 ; Shen et al 2021 ; Ma et al 2022 ; Zhai et al 2022 ; Zhang et al 2022 ). The conidia of Distoseptispora vary significantly in their characteristics, especially in terms of shape and size.…”

Lignicolous freshwater ascomycetes from Thailand: Introducing Dematipyriforma muriformis sp. nov., one new combination and two new records in Pleurotheciaceae

“…Among them, R. martini and R. queenslandica were transferred to Distoseptispora and Junewangia based on phylogenetic analysis ( Xia et al 2017 ). However, sequence data of R. martini are doubted by several studies ( Sun et al 2020 ; Shen et al 2021 ), as its morphology does not fit with the characters of Distoseptispora . Rhexoacrodictys erecta and R. fimicola clustered within Pleurotheciaceae ( Luo et al 2019 ; Dong et al 2021 ).…”