Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Ostropomycetidae V. Reeb, Lutzoni & Cl.Roux (2004)
         Order Ostropales Nannf. (1932)
           Family Thrombiaceae Poelt & Vězda ex J.C. David & D.Hawksw. (1991) [monotypic]
             Genus Thrombium Wallr. (1831)