Vegetabilia mycetoidea
   Kingdom Nematomyci
     Circulus Mucedines see Suborder Mucedines
       Semicirculus Mucedines polysporae
         Linea Mucedines liberae see Section Mucedineae liberae Nees
           Series Trichomyci see [unranked] Trichomyci Nees
             Genus Oidium Link (1809), nom. sanct., nom. rej. see Genus Oidium Link (1824), nom. cons.