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