Rimularia insularis (Nyl.) Rambold & Hertel
Lecidea insularis Nyl.
Lichenized fungus growing on other lichens.
Thallus forming islets on the host, areolate, grey-brown with olive tinge, prothallus conspicuous, black. Apothecia 0.2-0.6 mm diam., inserted between the areoles, then almost sessile, disc flat to convex, black, margin wavy, concolourous. Ascospores simple, ellipsoid, 9-14 x 4,5-7 µm. Photobiont: Chlorococcoid. Thallus : C+/- pink, medulla : I-. Grows on Lecanora rupicola mainly in coastal areas in the xeric supralittoral zone.*