Xanthoria aureola (Ach.) Erichs. forme saxicole de la zone aérohaline.

    Thallus foliose, up to 15-20 cm across,  lobes rather long, 2-5 mm wide, twisted, wrinkled, overlapping as roof tiles forming a thick mat, deep yellow-orange, bright orange when well-lit, yellow-orange, orange-green in shaded areas. Apothecia rare, irregular margin. This form, to be compared with the two others, is distinctive of the top of isolated rocks well exposed to sun, subjected to sea-spray but in the background of the sea shore. May also grow within plants towards the basis of these rocks (see pictures) or specially on bark of bushes or coastal shrubs. In this form, the lobes length is gradually shortened with the distance from the sea shore and it becomes difficult, if not impossible, to distinguish from Xanthoria parietina and Xanthoria calcicola that equally grow in this habitat.