Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Eurotiomycetidae Tehler ex Geiser & Lutzoni (2007), nom. inval.
         Order Onygenales Cif. ex Benny & Kimbr. (1980)
           Family Ascosphaeraceae L.S. Olive & Spiltoir (1955)
             1 Genus Arrhenosphaera Stejskal (1974)
             2 Genus Ascosphaera L.S. Olive & Spiltoir (1955)
             3 Genus Bettsia Skou (1972)