Kingdom Fungi R.T.Moore (1980) - fungi
   Subkingdom Dikarya Hibbett, T.Y. James & Vilgalys (2007)
     Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
       Subphylum Ustilaginomycotina Doweld (2001)
         Class Ustilaginomycetes Warm. (1884) - smut fungi
           Order Urocystales R. Bauer & Oberw. (1997), orth. inval. see Order Urocystidales R. Bauer & Oberw. (1997)
             Genus Ustacystis Zundel (1945)