Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus white or ashy-white, crustose, irregular, not well limited, to 1 mm thick, vemicose-areolate with deep chinks, the areolae to 1 mm broad, angular, bull ate, with secondary chinks and then somewhat roughened; with narrow, black hypothallus. Apothecia commonly contiguous and becoming angular, to 1 mm broad, deep in thallus like Lecidea tesselata but not aspicilioid; margin black, thin, becoming crenulate to disappearing; exciple exterior brownish to brownish violet, interior hyaline; disk flat or depressed, black, scabrid; hypothecium hyaline; epihymenium dark; hymenium 90 μm, upper part dark, lower hyaline; asci clavate; paraphyses slightly thickened above to 3 μm, tips dark; spores 8, 1-septate, center slightly constricted, walls thickened and lumina subangular, brown, 14-18 x 7-8 μm.
Reactions: K-, C-, P-, I-.
This species grows on calcareous rocks. It is known from Cape Humboldt, northeastern Greenland, the Okpilak River, northern Alaska, and the Melville Hills, Northwest Territories.