Molecular phylogeny and taxonomic revision of the genus Bolbitius (Bolbitiaceae, Agaricales) in Russia

Six species recorded from Russia in the genus Bolbitius were studied. Among them, B. bisporus and B. pallidus are described as new in this paper. Comprehensive descriptions of all species, illustrations, photographs and comparisons with similar taxa are provided. Phylogenetic analyses were conducted to aid in taxa delimitation as well as identification of species boundaries in the genus Bolbitius. Molecular phylogenetic reconstructions inferred from maximum likelihood and Bayesian analyses were based on combined datasets: nrITS-nrLSU for the whole set of studied species and nrITS-tef1-mtSSU for B. titubans specimens. The molecular data of three genetic markers indicate the existence of at least three divergent lineages in B. titubans, and each may represent an independent taxonomic unit, which suggests that B. titubans is likely a species complex rather than one widely distributed taxon.