Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Superclass Leotiomyceta O.E. Erikss. & Winka (1997)
       Class Sordariomycetes O.E. Erikss. & Winka (1997)
         Subclass Xylariomycetidae O.E. Erikss. & Winka (1997)
           Order Xylariales Nannf. (1932)
             1 Family Diatrypaceae Nitschke (1869)
             2 Family Graphostromataceae M.E.Barr, J.D. Rogers & Y.M. Ju (1993)