Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Xylonomycetes Gazis & P. Chaverri (2012) [monotypic]
       Order Xylonomycetales Gazis & P. Chaverri (2012), orth. inval. [monotypic]
         1 Family Xylonomycetaceae Gazis & P. Chaverri (2012), orth. inval.