Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Superclass Leotiomyceta O.E. Erikss. & Winka (1997)
       Class Arthoniomycetes O.E. Erikss. & Winka (1997)
         1 Order Arthoniales Henssen ex D.Hawksw. & O.E. Erikss. (1986)