Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes Subphylum Agaricomycotina Doweld (2001) Class Agaricomycetes Doweld (2001) Order Hysterangiales K. Hosaka & Castellano (2007) Family Mesophelliaceae Jülich (1982) Genus Castoreum Cooke & Massee (1887)