Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Lecanoromycetes O.E. Erikss. & Winka (1997) Subclass Acarosporomycetidae V. Reeb, Lutzoni & Cl.Roux (2004) [monotypic] Order Acarosporales V. Reeb, Lutzoni & Cl.Roux (2007) Family Acarosporaceae Zahlbr. (1906) Genus Caeruleum K. Knudsen & Arcadia (2012)