Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
       Order Pleosporales Luttr. ex M.E.Barr (1987)
         Family Montagnulaceae M.E.Barr (2001) see Family Didymosphaeriaceae Munk (1953)
           1 Genus Didymosphaerella Cooke (1889)
           2 Genus Kalmusia Niessl (1872)
           3 Genus Montagnula Berl. (1896)
           4 ?Genus Paraphaeosphaeria O.E. Erikss. (1967)