Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus within the rock, making a gray-white to gray-brown spot. Perithecia immersed in the rock, only the ostiole visible; exciple and involucrellum fused to appear as one, wrapping around the perithecium, slightly thicker at the ostiole, brownish black; gelatin 1+ blue; spores broadly ellipsoid, blunt, 23-30 X 15-17 µm.
This species grows in calcareous rocks. In Europe it has a wide range in the northern countries and in the Alps. It has been reported from Siberia, and from Port Clarence, Alaska (Nylander 1887 (1888)). Specimens from the Kukpuk River region, northwestern Alaska, are in WIS.