Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus nearly lacking, of few white, minute granules. Apothecia dispersed, to 0.5 mm broad, appressed to becoming substipitate; margin of same dark color as disk, entire, containing algae; cortex of margin of thick-walled hyphae in palisade-like vertical arrangement; disk black, becoming olivaceous when wet, epruinose; hypothecium hyaline, 1+ blue; epihymenium olive-brown, HN03+ green; hymenium 50-55 μm, hyaline, 1+ blue; paraphyses not branched, tips distinctly capitate to 5 μm in KOH; asci narrowly saccate; spores ellipsoid 10-12 x 4-5.5 μm.
Reactions: medulla K—, I —, C —.
This species grows on rocks. It is apparently very rare and is known only from Disko Island, Greenland, from a recent report from the Reindeer Preserve, Northwest Territories, by Ahti et al. (1973), and from a collection from Polar Bear Pass, Bathurst Island, Dickson 2364A (CANL).
A palisade-like amphithecial cortex like that in this species is also present in Lecanora behringii, but that species has a red-brown disk, white margin, reddish to violet-reddish epihymenium which is HNO3—, and slightly larger spores.