Like much of the Russulales, it has been defined through molecular phylogeny, and includes physically dissimilar species, such as the tooth fungus Auriscalpium and the gilled, often shelf-like members of Lentinellus.
The classification of this group is based on molecular data, despite its diverse members, including the tooth fungus Auriscalpium and the shelf-like gilled species of Lentinellus.