Tyromyces was described in 1881 (Karsten 1881) based on Tyromyces chioneus Karst. and includes about 30 widespread species (Kirk et al. 2008). Basidiomata are annual, resupinate to pileate, pore surface is white to cream and pores are regular, round to angular. The hyphal system is usually mono-, more rarely dimitic, the generative hyphae are hyaline, usually with clamps, and the cystidia are absent or present. The basidiospores are allantoid, cylindrical to ellipsoid, hyaline, smooth, thin-walled, non-amyloid to weakly amyloid (Ryvarden and Johansen 1980). According to Binder et al. (2013), Tyromyces is a small clade of white-rot polypores and apparently do not belong to any of the major lineages of Polyporales.