Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Ostropomycetidae V. Reeb, Lutzoni & Cl.Roux (2004)
         Order Trapeliales Hodk. & Lendemer (2011)
           Family Xylographaceae Tuck. (1888)
             1 Genus Lambiella Hertel (1984)
             2 Genus Lithographa Nyl. (1857)
             3 Genus Ptychographa Nyl. (1874)
             4 Genus Xylographa (Fr.) Fr. (1836)