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 Hypocreomycetidae O.E. Erikss. & Winka (1997)
           Order Hypocreales Lindau (1897)
             1 Family Clavicipitaceae Earle ex Rogerson (1970)
             2 Family Hypocreaceae De Not. (1844)
             3 Family Nectriaceae Tul. & C.Tul. (1865)
             4 ?Family Niessliaceae Kirschst. (1939)