Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
       Family Cookellaceae Höhn. ex Sacc. & Trotter (1913)
         1 Genus Cookella Sacc. (1878)
         2 Genus Pycnoderma Syd. & P.Syd. (1914)
         3 Genus Uleomyces Henn. (1895)