Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes Subphylum Agaricomycotina Doweld (2001) Class Agaricomycetes Doweld (2001) Order Hysterangiales K. Hosaka & Castellano (2007) Family Hysterangiaceae E. Fisch. (1899) Genus Circulocolumella S.Ito & S.Imai (1957)