Xanthoria calcicola Oxner var. calcicola (Taxon Atlantique) forme sur ciment ou sur béton.
This form is fairly common on all concrete or cement works by the sea. It is bright orange in places with high exposure to the sun, yellow in places in partial shade and yellow-greenish in places in shade. N.B. See Caloplaca verruculifera whose lobes are different and which has a particular habitat.