Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus thin or quite thick, verruculose, of granules to 0.15 mm, bluish white or ashy white, esorediate; hypothallus indistinct. Apothecia to 1.2 mm, adnate to moderately constricted; margin of same color as disk, persistent or disappearing; exciple of radial hyphae, reddish brown; disk flat to strongly convex, pale brown, reddish brown, brown-black or black, bare; hypothecium reddish brown or brown-black above, paler below, often with black granules; epihymenium yellowish brown; hymenium hyaline below, yellowish brown above, sometimes with black granules; 70-80 μm; paraphyses slender or tips slightly larger; asci clavate; spores ellipsoid, simple or sometimes 1-septate, 10-14 x 3-5 μm.
Reactions: K—, C—, P—, I—.
This species grows over moss. It is circum-polar and boreal.