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 Roccellaceae Chevall. (1826)
           Genus Dirinastrum Müll.Arg. (1893) see Genus Buellia De Not. (1846), nom. cons.