homobasidiomycetes: category used in some classification systems for various basidiomycetous fungi including e.g. mushrooms and puffballs which are usually placed in the classes Gasteromycetes and Hymenomycetes
class: (biology) a taxonomic group containing one or more orders
conceptualism: the doctrine that the application of a general term to various objects indicates the existence of a mental entity that mediates the application