Xanthoria calcicola Oxner var. calcicola Taxon méditerranéen.
Xanthoria aureola auct. brit. (avant 1984).
Xanthoria parietina var. aureola auct. brit.
Differs from the Atlantic corresponding taxon (Xanthoria calcicola var. calcicola Atlantic Taxon ) by its habitat on acid rocks (granite) and bigger and more numerous apothecia.
N.B. Very close to Xanthoria mediterranea Giralt, Nimis & Poelt. Distinctive traits of the latter are: thallus up to 5 cm diam., narrow lobes (2-3 mm wide), very scarce apothecia, numerous granulose clavate isidia, 0.1-2 mm high. Habitat: on nutrient-rich calcareous rocks near the sea; restricted to mediterranean coasts.