Xanthoria calcicola var. ectaniza (Nyl.) Cl. Roux Cf.
Xanthoria aureola forma Cf.
Xanthoria Cf. parietina subsp. ectanea ss. Clauzade & Cl. Roux
Thallus foliose, loosely attached to the substratum, lobate, lobes 1-3 mm across, sometimes markedly indented or strap-shaped, convoluted, pleated or wrinkled, partially overlapping, yellow, yellow-orange, yellow-greenish according to exposition, isidia absent but minute warts may be found towards the thallus center. Apothecia scarce or absent. Disc orange, thalline exciple concolorous. The specimen presented here thrives in Corsica on calcareous rocks, 5 km from the seashore and at 350 m above sea level and 'exposed to the sea'. Close to Xanthoria aureola on the Atlantic coasts, similarly distant from the seashore, it may be a transition form with the Xanthoria parietina group. Additional investigation are required in order to clarify this issue.
N.B. This Mediterranean taxon seems to have been named Xanthoria aureola by some authors but it is different from this last Atlantic species and would deserve a special study and a new name.