Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Lecanoromycetes O.E. Erikss. & Winka (1997) Subclass Lecanoromycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch (2007) Order Rhizocarpales Miądl. et al. ex Miądl. & Lutzoni (2016) Family Rhizocarpaceae M. Choisy ex Hafellner (1984) Genus Rhizocarpon Ramond ex DC. (1805)