Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Sordariomycetes O.E. Erikss. & Winka (1997) Subclass Sordariomycetidae O.E. Erikss. & Winka (1997) Family Annulatascaceae S.W. Wong, K.D.Hyde & E.B.G.Jones (1998) Genus Cyanoannulus Raja, J. Campb. & Shearer (2003)