Fungi (Jahn & Jahn, 1959)
   Class Gymnocarpi
     Order Hymenothecii
       Hydnoidei
         Genus Sistotrema Pers. (1794), nom. inut.
           * Stipitata.
           ** Pileo dimidiato.
           *** Resupinata effusa, dentibus difformibus subincisis (Xylodon). Pers. (1801)