Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus dark gray-brown to dark brown, thick, of large rugose areolae to 1.7 mm broad, the marginal areolae sometimes minutely lobu-late; partly with a narrow black hypothallus. Apothecia innate at first, becoming sessile, to 1.5 mm broad; margin persistent, entire to flexuous or crenate; thalloid exciple 80-100 μm, cellular, cortical cells dark; proper exciple 10-15 μm laterally, broadening above; disk black, flat, becoming convex; hypothecium hyaline and forming a stipe below; epihymenium brown; hymenium 70-90 μm; paraphyses 2.5-3 μm, tips 4-6 μm and red-brown; spores of Pachysporaria-type with thick walls, angular lumina, septum well developed, outer wall dark and rough, 13-25 x 9-14 μm unilocular spores dominant in some apothecia.
This species grows on siliceous rocks. It was first described from Europe. Mayrhofer & Sheard (1988) recorded it also from Spitzbergen, Novaya Zemlya, and western Greenland in both the Disko Island and Julianehaab regions. It may well turn up in the American Arctic.