Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus yellow-white to ash-gray, thin to fairly thick not zonate, smooth to tuberculate, more or less shiny, continuous, lacking soredia or isidia. Fertile verrucae lecanorate, of same color as thallus, crowded, sometimes appearing more or less papillate, to 1 mm broad; margins crenulate to lacerate; disks black, sunken, shiny, pruinose, to 0.4 mm broad. Apothecia 1 per verruca, to 0.53 mm broad, center hyaline to yellow-brown or white; hypothecium pale; epithecium pale or dark, K+ strongly violet; asci cylindrical; spores 2 (rarely 1), uniseriate, spore wall single, 6-12 μm thick, smooth, more or less concentrically laminated at ends, usually thicker at tips and convex toward interior, end walls then 12-24 μm thick, ellipsoid to cylindrical, 192-319 x 55-76 μm.
Contents: thiophanic acid (?), stictic acid, constictic acid, and two unknowns.
This species grows on humus and moss over soil. It is known only from Churchill, Manitoba, and Belle Isle Strait, Labrador. Other reports, including mine, are misidentifications due to errors in original description, as discussed by Dibben (1980).