Survey of Volvariella (Agaricales, Basidiomycota) including Two New Species, V. neovolvacea and V. thailandensis, from Northern Thailand

Abstract

During the period from 2018 to 2020, a survey of macrofungi in northern Thailand was conducted and seven specimens of Volvariella were collected. The morphological characteristics and phylogenetic analyses of the internal transcribed spacers (ITS) and large subunit (nrLSU) of the nuclear ribosomal DNA (rDNA) sequence data indicated that three specimens belonged to V. bombycina and V. volvacea. Four other specimens were distinct from all other known species within the genus Volvariella. We described these specimens as two new species, namely V. neovolvacea and V. thailandensis. Comprehensive descriptions, illustrations, line drawings, and a phylogenetic tree are provided to show the position of the two new species. The comparisons between morphologically similar and phylogenetically related species are also discussed.