Three new species within the genus Entoloma (Basidiomycota, Agaricales) with clamped basidia and a serrulatum-type lamellae edge, and their phylogenetic position

Three new species of the gD mu nus Entoloma s.l. are described on the basis of morphological and molecular evidence. Two of them are morphologically and phylogenetically closely related to the European species E. violaceozonatum but differ sufficiently by their geographic distribution: E. bulakhae is from the Russian Far East and E. bidupense from Vietnam. The more distant E. atricolor from Vietnam is remarkable because of the brownish-black color of the basidiomata, blackish lamellae edge near the stem, and observed dimorphism in cheilocystidia. These three species are characterized by the combination of clamped basidia and a serrulatum-type lamellae edge and grouped together within the /Inocephalus-Cyanula clade in sister position to /Inocephalus and /Griseorubida. It is argued that they may possibly constitute a separate section in future, when more data will be available. For this reason, section Violaceozonata is proposed here ad interim to acknowledge the current isolated position.