Gyalolechia gomerana (J. Steiner) Sachting, Fröden & Arup = Caloplaca gomerana J. Steiner

      Placodioid thallus strongly attached to its substrate, formed of convex lobes arranged in a rosette, radiating and giving a palmate appearance at the margin, upper surface more or less warty and verrucose in the center, yellow-orange, bright orange with lighter or whitish spots (medulla) sometimes giving the impression of pseudocyphellae. Apothecia often numerous, small and less than 0.5 mm in diameter, disc concave then flat, bright orange, brown-orange more intense than the thallus, margin thick and distinct, concolorous to the thallus. Polarilocular spores, 7.5-12 x 5-7 µm with a 3-4 µm septum. Macaronesian thermophilic species growing on coastal volcanic rocks, very sunny and very dry.