Phylogenetic affinities of the sequestrate genus (Boletaceae), with a new species, from Thailand.

is a small sequestrate genus in Boletaceae with two described species, and . Phylogenetic analyses of a three-gene dataset including 6, 1 and 2 of species along with selected Boletaceae species showed that all species formed a monophyletic clade, sister to the genera and in subfamily Leccinoideae with high support. All of the taxa in the clade have a similar chemical reaction in which basidiospores turn purplish, purplish red to violet or violet grey when in contact with potassium hydroxide. The molecular analyses also showed that all specimens collected from Ubon Ratchathani province, northeastern Thailand, belong to a new species. Morphologically, the new species is different from others by having a markedly prominent hilar appendage and a terminal hilum on its basidiospores. Thus, the new species, , is introduced with detailed macroscopic and microscopic descriptions and illustrations.