A new section and species of Agaricus subgenus Pseudochitonia from Thailand

• Main Authors: Mao Qiang He, Boontiya Chuankid, Kevin D. Hyde, Ratchadawan Cheewangkoon, Rui Lin Zhao
• Format: Journal
• Published: 2018
• Subjects: Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85054026311&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/62511
• Institution: Chiang Mai University

© 2018 Pensoft Publishers. All rights reserved. A large species diversity has recently been discovered in the genus Agaricus. Six subgenera and 23 sections are now recognised. In this study, three specimens collected from Thailand, formed a monophyletic clade in subgenus Pseudochitonia, based on analyses of ITS sequence data. Further analyses, based on multi-gene sequence data (ITS, LSU, tef1-α), using BEAST, revealed that this clade originated 26.7 Ma. According to their distinct morphological characteristics, phylogenetic position and relatively old divergence time, a new section Cymbiformes is proposed and this section is represented by a new species A. angusticystidiatus. This new section is characterised by the strong iodoform odour of basidiomes and cymbiform basidiospores. Descriptions, colour photographs and illustrations are presented.