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

Hong-Wei Shen,Kevin D Hyde,Dan-Feng Bao,Hong-Yan Su,Zong-Long Luo,Darbhe J Bhat

doi:10.3897/mycokeys.84.71905

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 Distoseptisporabangkokensis 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.

Highlights

Distoseptisporaceae was introduced by Su et al (2016) based on morphological and phylogenetic analyses, with Distoseptispora as type genus
Distoseptisporaceae is placed in Distoseptisporales, which was introduced by Luo et al (2019), and currently comprises two families, Aquapteridosporaceae and Distoseptisporaceae (Luo et al 2019; Wijayawardene et al 2020; Hyde et al 2021)
The dataset composed of LSU (1–744 bp), ITS (745–1310 bp), TEF1-α (1311–2161 bp), RPB2 (2162–3178 bp), and SSU (3179–4199 bp) gene, comprising a total of 4199 characters, including 56 taxa with Pseudostanjehughesia aquitropica (MFLUCC 16-0569) and P. lignicla (MFLUCC 15-0352) as the outgroup taxa (Figure 1)

Summary

Introduction

Distoseptisporaceae was introduced by Su et al (2016) based on morphological and phylogenetic analyses, with Distoseptispora as type genus. The genus is characterized by monoblastic, cylindrical, conidiogenous cells, with percurrent proliferation, acrogenous, solitary, brown or yellowish/reddish brown, olivaceous, distoseptate or euseptate, cylindrical, obclavate, rostrate conidia, truncate base, with rounded apices, basal cell with a cross wall and basal scar. This genus is not known for its sexual morph (Su et al 2016; Yang et al 2018; Hyde et al 2019, 2020; Luo et al 2019; Sun et al 2020). 32 species are accepted in the genus of which 13 from terrestrial habitats and 19 were reported from freshwater environments (Su et al 2016; Hyde et al 2016a, 2019, 2020; Xia et al 2017; Yang et al 2018; Luo et al 2018, 2019; Monkai et al 2020; Song et al 2020; Sun et al 2020; Li et al 2021; Index Fungorum 2021 http://www.indexfungorum.org)

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Conclusion