Rossbeevera yunnanensis (Boletaceae, Boletales), a new sequestrate species from southern China

A new sequestrate (truffle-like) species, Rossbeevera yunnanensis, is described based on a collection from Chuxiong Prefecture, Yunnan Province, China. The species is morphologically characterized by its large, narrow, fusoid to fusiform basidiospores and remarkably thin peridium. Maximum likelihood and neighbor joining phylogenies of our nLSU rDNA dataset indicate that the species constitutes the earliest diverging lineage within the genus Rossbeevera and has a close phylogenetic relationship to species of Leccinellum. Morphological and phylogenetic relationships to the other Asian members of Rossbeevera are discussed.