Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus pale ashy to ashy brown, lacking pruina, of contiguous or scattered areolae which are angular or rounded, to 0.35 mm broad, convex, lacking soredia or isidia; hypothallus lacking.
Apothecia dispersed, to 0.5 mm broad, simple or rarely seemingly composite and then larger, to 1.2 mm; margin raised and thick, entire and persistent; cortex of thalloid exciple brownish, the margin hyphae fan-shaped radiate; hypothecium hyaline; epihymenium olive; hymenium 90-100 μm, I+ blue turning wine-red; paraphyses 2-2.5 μm, tips moniliform; spores broadly ovate, 14-23 X 10-12.5 μm. Conidia not known.
Reactions: medulla K-, C-, P-, I-.
This species grows on calcareous rocks. It has seldom been collected but is known from Greenland, Alaska, and the Northwest Territories.