Three nodulose-spored Inocybe (Agaricales, Basidiomycota) species discovered from Motuo, Southwest China

By

Zhu, An-Hong
Xu, Yan-Ru
Ma, Hai-Xia
Yu, Wen-Jie

Type

Article

Date of Publication

2025-9-11

Original Publication

MycoKeys

Volume

122

Pages

99--121

Subjects

Inocybaceae , novel species , Phylogeny , tropical China , Xizang

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers 2011-

Identifiers

DOI: https://doi.org/10.3897/mycokeys.122.163942

 

Abstract

The species diversity of the ectomycorrhizal family Inocybaceae is poorly understood in tropical regions. The present work concerns a survey of macrofungi from Motuo in Xizang, which is located at the northern edge of China’s tropical zone. Three new species were identified using morphological features and DNA sequences (ITS, LSU and RPB2). Inocybe flavitomentosasp. nov. belongs to section Umbraticae. It has a yellow, densely hairy cap and angular spores with faint knobs. This is the first species in its group to be found in the Chinese tropics. Inocybe motuoensissp. nov. forms a basal branch in the I. xanthomelas group. It is the only purely tropical species in this group. It has a yellowish-brown cap, no caulocystidia and spores bearing 7–11 rounded nodules. Inocybe subchondrosporasp. nov. belongs to the I. fibrosoides group. Resembling the northern species I. chondrospora, it has smaller spores (10.1–12.9 × 6.0–7.2 µm) and grows in subalpine areas at an elevation of 2,400–2,500 m. These discoveries expand the known range of Inocybe in tropical Asia and support the idea that the I. xanthomelas group likely originated in tropical regions.