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.
           1 Genus Byssocaulon Mont. (1835)
           2 Genus Chrysothrix Mont. (1852), nom. cons.