Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Arthoniomycetes O.E. Erikss. & Winka (1997) 1 Order Arthoniales Henssen ex D.Hawksw. & O.E. Erikss. (1986) 2 Order Lichenostigmatales Ertz, Diederich & Lawrey (2014) [monotypic]