Ramalina siliquosa Chem. siliquosa = Chem. scopularum = Chem a

    Characterized by its chemical spot tests reactions: C-, K- (or K+ slightly brown-yellow), KC- or KC+ slightly reddish), Pd+ red-orange, UV +/- white/pale blue (protocetraric acid). General aspect: very dense tuft made of markedly ramified branches, notably towards the base with secondary branches deer horn-shaped, twig surface more or less scattered with pycnidia, nodulose to verrucose. Grey-greenish when moist and grey-yellowish when dry. Apothecia lateral, sometimes numerous in the xeric supralittoral zone, more scarce or absent in terrestrial zones. Relatively common taxon on not too acidic siliceous rocks from the xeric supralittoral zone to the aerohaline zone, especially in sheltered zones (Rade de Brest).

N.B. Characteristic taxon of dry stone walls by the sea.