Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
   Subphylum Agaricomycotina Doweld (2001)
     Class Tremellomycetes Doweld (2001)
       Order Trichosporonales Boekhout & Fell (2001)
         1 Family Tetragoniomycetaceae Oberw. & Bandoni (1981) see Family Rhynchogastremaceae Oberw. & B. Metzler (1989)
         2 Family Trichosporonaceae Nann. (1934)