Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
       Order Hysteriales Lindau (1896)
         Family Hysteriaceae Chevall. (1826)
           Genus Hysterium Pers. (1797), nom. sanct.