Parmotrema robustum (Degel.) Hale forme saxicole.

    This morph may grow up to a very large size (20-30 cm). Rather common, on, or at the base of rocks in the aerohaline zone on heads and capes of the Finistère, sometimes on the large rocks of the oceanic woods by the sea. Differs from the type by its lobes, crowded and overlapping, its lobes potentially with undulate and upturned margins.

N.B. Watch out for Flavoparmelia caperata des landes aérohaline, which has yellow tones.