The generic name Pellicularia Cooke is rejected as a nomen confusum. Genera and species commonly associated with Pellicularia’ are reviewed. Koleroga Donk is regarded as a synonym of Ceratobasidium Rogers. Two new combinations are made: Oliveonia atrata (Bres.) comb. nov. and Thanatephorus sterigmaticus (Bourd.) comb. nov. The genera dealt with are divided among the Tulasnellaceae and the Corticiaceae, the family Ceratobasidiaceae being regarded as superfluous. The subclasses Heterobasidiomycetes and Homobasidiomycetes are not recognised, as it is impossible to suggest characters by which they may consistently be delimited. The characters normally used for delimiting these subclasses are, however, still regarded as of great importance for separating lower taxonomic categories. Generic diagnoses, keys to species and nomenclators of species are provided.