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), incertae sedis Genus Pycnoderma Syd. & P.Syd. (1914)