Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Laboulbeniomycetes Engl. (1897) Order Pyxidiophorales P.F. Cannon (2001) [monotypic] Family Pyxidiophoraceae Arnold (1971) Genus Mycorhynchidium Malloch & Cain (1971)