Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Eurotiomycetidae Doweld (2001)
         Order Ascosphaerales Gäum. ex Skou (1982) see Order Onygenales Cif. ex Benny & Kimbr. (1980)
           1 Family Ascosphaeraceae L.S. Olive & Spiltoir (1955)
           2 Family Eremascaceae Engl. & E. Gilg (1924)