Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Arthoniomycetes O.E. Erikss. & Winka (1997) Order Arthoniales Henssen ex D.Hawksw. & O.E. Erikss. (1986) Family Lecanographaceae Ertz, Tehler, G. Thor & Frisch (2014) Genus Zwackhia Körb. (1855)