substrate: rock siliceous, siliciferous, acidic | rock, stones, pebbles unspecified.
Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Thallus umbilicate, mono- or polyphyl-lus, usually deeply incised and folded; margins fragile and slightly perforate; upper side rough-ribbed becoming chinky areolate toward the margins, the center pruinose over the umbo, dull, dark brown to brown-black; lower surface smooth to subpapillose, sooty roughened, the margins paler, tiny areolate.
Thallus ca. 250 µ thick; upper cortex 33 µ, medulla 33 µ, lower cortex about 83 µ.
Apothecia stipitate, to 2 mm broad, disk flat, black, margin even, dark; hypothecium black; hymenium 50 µ, brownish; paraphyses unbranched, septate, the tips capitate, to 2.4 µ; spores simple, hyaline, middle dark stained, 4-4.8 X 12-15 µ.
Reactions: not checked.
This is a rare bipolar species known only from western Greenland (Inglefield Land in the north and Igdlut in the south central part) and northern Somerset Island in North America. In Europe it occurs in Norway, Switzerland, and Hungary. I have not seen this species.