Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus yellowish cream or pale clay-colored, soft, areolate, the areolae flattish or slightly convex, irregular, those to the periphery not radiate but longer in the radiant direction; hypothallus indistinct, may be whitish. Apothecia innate and becoming adnate to quite highly raised, to I mm broad; margin concolorous with thallus, darker within; disk black, often composite, flat to convex, bare; thalloid margin I-; hypothecium hyaline, 1+ blue; epihymenium brownish olive, inspersed; hymenium 70-100 µm, 1+ blue; paraphyses moniliform in KOH; asci saccate, of aduans type; spores 8, ellipsoid, 15-20 x 10-12 µm.
Reactions: medulla K+ yellowish mist, c-.p-.i-.
Contents: substance causing the yellow mist not identified but docs not appear to be atranorin.
This species grows on acid rocks. It is known from Greenland (Disko Island), and Ellesmere Island.
I cannot see a difference between this species and Lecanora basaltica Lynge. The KOH reaction of both is not very definitive, and Lynge himself (1937) wrote that he was uncertain of the validity of L. basaltica and that the material of L. narxsaquensis was in better condition. Hence the latter epithet was preferred here.