organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Fungi R.T.Moore (1980) - fungi
       Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
         Class Ascomycetes G.Winter (1880) see Phylum Ascomycota Caval.-Sm. (1998)
           Subclass Sordariomycetidae O.E. Erikss. & Winka (1997)
             Order Xylariales Nannf. (1932)
               1 Family Amphisphaeriaceae G.Winter (1885)
               2 Family Cainiaceae J.C. Krug (1978)
               3 Family Clypeosphaeriaceae G.Winter (1886) see Family Xylariaceae Tul. & C.Tul. (1861)
               4 Family Diatrypaceae Nitschke (1869)
               5 Family Graphostromataceae M.E.Barr, J.D. Rogers & Y.M. Ju (1993)
               6 Family Hyponectriaceae Petr. (1923)
               7 Family Myelospermataceae K.D.Hyde & S.W. Wong (1999)
               8 Family Xylariaceae Tul. & C.Tul. (1861)