Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Chytridiomycota Doweld (2001)
     Class Chytridiomycetes Moebius (1929)
       Genus Rhizosiphon Scherff. (1926), incertae sedis
         1 Rhizosiphon crassumᵀ Scherff. (1926)