Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus crustose, verrucose, verrucules 0.4-0.7 mm broad, grouped closely or dispersed, pale yellowish to brownish or dark brownish, sometimes reddish; the algae Trentepohlia.
Perithecia embedded in verrucae, to 0.5 mm broad, spherical; exciple yellowish to pale brownish, dark around ostiole; paraphyses slender, not branched; asci as for the genus; spores 8, acicular, hyaline, elongate-pointed but sometimes with upper tip slightly rounded, 8-30-celled but usually about 20-celled, cells cylindrical, 50-110 X 3 μm.
This species grows on rocks, usually with some basic (high pH) content. It was also collected on old, rotting wood in Novaya Zemlya by Lynge (1928). This species is known from Novaya Zemlya, through Scandinavia to middle Europe, in the Alps. It is also reported from Siberia by Almquist (1879) and from Godhavn, Greenland by Alstrup (1981); it also occurs at Narssaq. It appears to be circumpolar, and from North America there is a specimen in CANL from Mt. Albert, Matane Co., Quebec, collected by L. Sirois.