Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Sordariomycetes O.E. Erikss. & Winka (1997) Subclass Hypocreomycetidae O.E. Erikss. & Winka (1997) Order Hypocreales Lindau (1897) Family Clavicipitaceae Earle ex Rogerson (1970) Genus Heteroepichloë E. Tanaka, C. Tanaka, Gafur & Tsuda (2002)