Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Class Pneumocystidomycetes O.E. Erikss. & Winka (1997)
     Order Pneumocystidales O.E. Erikss. (1994)
       Family Pneumocystidaceae O.E. Erikss. (1994)
         1 Genus Pneumocystis P. Delanoë & Delanoë (1912)