Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus white or blue-gray, usually with a pale hypothallus, verrucose to squamulose with convex upper surfaces. Apothecia numerous, dispersed or loosely grouped, closely adnate, 1-1.5 mm broad; margin thick, prominent in some specimens, in others the proper exciple is thin and separate from the thalloid margin, which becomes thick, crenulate, and reflexed; the apothecial cortex is of paraplectenchymatous hyphae bordered by a thin anticlinal layer which may appear spinulose, the outer layers inspersed with a violet-gray amorphous substance; disk dark brown, rough, flat; hymenium 70-80 µm; paraphyses clavate to capitate, tips to 6 µm and covered with a violet-gray substance; spores 8, often poorly developed, 12-18 X 6.5-8 µm, septum 2-3.5 µm.
This species is found on calcareous rocks, basalts, and gneisses, growing in seepage areas. It was described from Europe and the Mediterranean region, reported from Disko Island and Christians-haab regions in Greenland. Anderson (1967) reported it from Colorado, so that it should occur in the American Arctic, although no records are yet known.