Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Lecanoromycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch (2007)
         Order Peltigerales Walt. Watson (1929)
           Family Massalongiaceae Wedin, P.M. Jørg. & E. Wiklund (2007)
             1 Genus Leptochidium M. Choisy (1952)
             2 Genus Massalongia Körb. (1855)
             3 Genus Polychidium (Ach.) Gray (1821)