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 Chrysotrichaceae Zahlbr. (1905), nom. cons. Genus Byssocaulon Mont. (1835)