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)