Additions to the taxonomy of Lagarobasidium and Xylodon (Hymenochaetales, Basidiomycota)

is a small genus of wood-decaying basidiomycetes in the order Hymenochaetales. Molecular phylogenetic analyses have either supported as a distinct taxon or indicated that it should be subsumed under , a genus that covers the majority of species formerly placed in . We used sequences from the ITS and nuclear LSU regions to infer the phylogenetic position of the type species . Analyses confirm as a synonym of . Molecular and morphological information show that the traditional concept of covers at least two species, from Europe and with known distribution in Europe and North America. Three species currently placed in are transferred to , viz. , and . Three new species are described and illustrated, and from East Asia and from the Pacific Northwest America. The identity of , described from Sri Lanka, is discussed.