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 Microascales Luttr. ex Benny & Kimbr. (1980) Family Ceratocystidaceae Locq. ex Réblová, W. Gams & Seifert (2011) Genus Ambrosiella Brader ex Arx & Hennebert (1965)