Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus dark ashy, sometimes pruinosc, composed of scattered areolae to 0.5 mm broad, the areolae broadening at base; cortex paraplectenchymatous; usually the substratum around the areolae dark-colored, but without well-developed hypothallus. Apothecia single per areola; disk black, epminose, concave; margin I-; hypothecium cloudy, 1+ orange (slowly); epihymenium dark olive, HC1+ green; hymenium 85-90 µm, 1+ blue (Magnusson (1939) noted orange-brown); paraphyses moniliform; spores 8, ellipsoid to subglobose, 11-17 x 7-10 µm. Conidia straight, 13-14 x 0.7 µm.
Reactions: K-, C-, P-, I-.
This species grows on calcareous rocks in full sun. It is known from Siberia. Alaska, and near the mouth of the Mackenzie River. It may be a representative of the Beringian element in the flora.