Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus moderately thick, to 1 mm, deeply areolate, areolae angular, flat to convex, surface minutely cracked, yellow, smooth waxy to bony shining; black hypothallus visible between, soft when wet. Apothecia becoming conglomerate, raised on thallus, up to 2 mm broad; margin at first prominent, becoming excluded as disk changes from flat to convex; exciple strongly adspersed, exterior with thin dark layer, interior hyaline; disk black, epruinose, scabrid; hypothecium hyaline; epihymenium bluish olive; hymenium 45-50 μm, hyaline; paraphyses septate, strongly coherent, 2.5-3 μm; asci narrow; spores narrowly oblong, straight or slightly curved, 7-10 x 2.5-3 μm.
Reactions: K—, P—, I—; hypothecium and hymenium 1+ blue; epihymenium very blue with HC1 or HN03.
This species grows on siliceous rocks. Its range is very uncertain because of lack of collections. It was described from Greenland, and I have collections from the headwaters of the Cache River, and the Melville Hills, Northwest Territories.