Regnum Mycetoideum
   Class Hyphomycetes Fr. (1821) see Class Monilia A.Rich. (1832)
     Order Inomycetes
       Suborder Mucedines
         Hypochni
           1 Genus Oidium Link (1809), nom. sanct., nom. rej. see Genus Oidium Link (1824), nom. cons.
           2, 3 Genus Hypochnus Fr. (1818), nom. sanct. see Genus Tomentella Pers. ex Pat. (1887), nom. cons.
           4 Genus Geotrichum Link (1809), nom. sanct.