﻿Emending Gymnopus sect. Gymnopus (Agaricales, Omphalotaceae) by including two new species from southern China.

Ji-Peng Li,Lu Jiang,Vladimír Antonín,Chun-Ying Deng,Yu Li,Bin Song,Genevieve Gates,Tai-Hui Li

doi:10.3897/mycokeys.87.76125

Abstract

Based on phylogenetic analyses, some newly studied Chinese mushroom specimens were found to represent two distinct species within the genus Gymnopus. Along with G.fusipes (sect. Gymnopus) they form a distinct clade with high support, although their macromorphological characters seem to be closer to members of Gymnopus sect. Levipedes or sect. Vestipedes (Collybiopsis). When examined in detail, their micromorphological characters, especially the type of pileipellis, support them as new members of G. sect. Gymnopus. Therefore, two new species, G.omphalinoides and G.schizophyllus, and the emended circumscription of sect. Gymnopus are proposed in this paper. Detailed morphological descriptions, colour photos, illustrations of the two new species, morphological comparisons with similar taxa and the molecular-phylogenetic analyses of the combined nrITS and nrLSU data are presented. A key to the known species of G. sect. Gymnopus is also presented.

Highlights

IntroductionGymnopus is a monotypic section and its type species, Gymnopus fusipes (Bull.) Gray, typifies the genus (Antonín and Noordeloos 2010)
G. fusipes was placed in Collybia (Fr.) Staude sect
A BLAST search of nuclear ribosomal internal transcribed spacer (nrITS) sequences revealed that a sequence annotated as “Micromphale foetidum” (KP877447) was the most similar (7–8 different sites or more than 98.16% similarity) to the two new species described in this study

Summary

Introduction

Gymnopus is a monotypic section and its type species, Gymnopus fusipes (Bull.) Gray, typifies the genus (Antonín and Noordeloos 2010). G. fusipes was placed in Collybia (Fr.) Staude sect. Several species, several sections, were moved from Collybia to Gymnopus, a genus that was defined mainly based on American and European material (Antonín et al 1997). The character of the pileipellis, especially the terminal cells, has become a significant factor in the delimitation of the sections within the genus. After undergoing a series of revisions, Gymnopus sensu lato (s.l.) was restricted as a monophyletic genus The other three sections are G. sect. Levipedes (Quél.) Halling (Oliveira et al 2019)

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