Kingdom Fungi R.T.Moore (1980) - fungi Subkingdom Dikarya Hibbett, T.Y. James & Vilgalys (2007) Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Taphrinomycotina O.E. Erikss. & Winka (1997) - basal ascomycetes Class Pneumocystidomycetes O.E. Erikss. & Winka (1997) Order Pneumocystidales O.E. Erikss. (1994) Genus Pneumocystis P. Delanoë & Delanoë (1912)