Beta-tubulin and Actin gene phylogeny supports Phaeoacremoniumovale as a new species from freshwater habitats in China.

Shi-Ke Huang,D Jayarama Bhat,Ting-Chi Wen,Kevin D Hyde,Putarak Chomnunti,Rajesh Jeewon

doi:10.3897/mycokeys.41.27536

Shi-Ke Huang, D Jayarama Bhat + Show 4 more

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https://doi.org/10.3897/mycokeys.41.27536

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Abstract

A new species of Phaeoacremonium, P.ovale (Togniniaceae), was isolated during a diversity study of freshwater fungi from Yunnan Province in China. Morphological and cultural studies of the fungus were carried out and its sexual and asexual morphs (holomorph) are introduced herein. This species is characterised by peculiar long-necked, semi-immersed ascomata with oval to ellipsoid ascospores and ellipsoid to ovoid conidia. Phylogenetic analyses of a combined TUB and ACT gene dataset revealed that strains of P.ovale constitute a strongly supported independent lineage and are related to P.griseo-olivaceum and P.africanum. The number of nucleotide differences, across the genes analysed, also supports establishment of P.ovale as a new species.

Highlights

Lignicolous freshwater fungi are important in nutrient recycling (Hyde et al 2016)
While most of the species are commonly isolated as asexual morphs, some taxa have been recovered in their sexual morph state, viz. Phaeoacremonium aquaticum (= Togninia aquatica), P. viticola (= T. viticola), P. novae-zealandiae (= T. novae-zealandiae) (Hausner et al 1992; Mostert et al 2006a; Hu et al 2012)
We introduce a novel taxon of Phaeoacremonium from dead wood collected in a stream in the Yunnan Province, China and describe its sexual and asexual morph

Summary

Introduction

Lignicolous freshwater fungi are important in nutrient recycling (Hyde et al 2016). A number of taxonomic studies have focused on the diversity of such fungi in the South East Asian region and these investigations have reported a number of novel species (e.g. Jeewon et al 2003; Cabanela et al 2007; Zhang et al 2008; Luo et al 2018). A number of taxonomic studies have focused on the diversity of such fungi in the South East Asian region and these investigations have reported a number of novel species We report a new species of Phaeoacremonium isolated from decaying wood from a stream in Yunnan Province, China. Phaeoacremonium (= Togninia), introduced by Crous et al (1996), is typified by P. parasiticum and it belongs to Togniniaceae (Gramaje et al 2015). Phaeoacremonium was reported to be the asexual morph of Togninia (Mostert et al 2003, 2006a; Pascoe et al 2004). Gramaje et al (2015) proposed Phaeoacremonium over Togninia as the correct name based on common usage and this has been listed in Réblová et al (2016) and followed in Wijayawardene et al (2018). The species are basically characterised by black ascomata with a long neck and clavate to cylindrical asci with oval to ellipsoid, hyaline ascospores and straight or flexuous mononematous conidiophores with oval to reniform phialo-conidia (Marin-Felix et al 2018; Spies et al 2018)

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