Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
   Subphylum Ustilaginomycotina Doweld (2001)
     Class Ustilaginomycetes Warm. (1884) - smut fungi
       Order Urocystidales R. Bauer & Oberw. (1997)
         Family Urocystidaceae Begerow, R. Bauer & Oberw. (1998)
           Genus Urocystis Rabenh. ex Fuckel (1870), nom. cons.