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 Exobasidiomycetes Begerow, M. Stoll & R. Bauer (2007)
           Order Microstromatales R. Bauer & Oberw. (1997)
             1 Genus Microstroma Niessl (1861)
             2 Genus Sympodiomycopsis Sugiy., Tokuoka & Komag. (1991)
             3 Genus Volvocisporium Begerow, R. Bauer & Oberw. (2001)