Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes Subphylum Agaricomycotina Doweld (2001) Class Agaricomycetes Doweld (2001) Order Trechisporales K.H. Larss. (2007), incertae sedis Family Hydnodontaceae Jülich (1982) Genus Brevicellicium K.H. Larss. & Hjortstam (1978)