Malme, GO A:N 1932. Lichenes Orae Sibiriae Borealis: Inde ab Insula Minin usque ad Promontorium Ryrkajpia in Expeditione Vegae Lecti. Arkiv For Botanik. 25A: 27-28.
Crust broadly effuse, thick, formed from semiglobose or irregular verrucae, up to 0.5 mm broad, contiguous or somewhat/slightly dispersed (or if rimose-areolae, areolae convex), ashy grey, soiled tawny yellow or yellowish brownish-ashy gray, opaque, neither KOH nor hypochlor. calc. reacts (or KOH slightly yellowish), protothallus conconcolourous; medullar hyphae moderately pachydermatous, minutely lax, woven together, I-; gonidia globose, diam. up to 13 µ, forming continuous layer; cortex up to 20 µ thick, almost amorphous above. Apothecia crowded, initially innate in thalline areoles and thalline margin minutely thick, entire, prominent, ornate, then largely elevated, adnate, base barely or not constricted, 0.6-0.8 mm, rarely up to 1 mm broad, (thalline margin almost entirely excluded), proper margin slightly thin, black, naked, disc plane, blackish, ashy gray or lavender-blue pruinose. Subhymenium (and also central part of exciple) hyaline, formed from pachydermatous hyphae, crowded and irregularly woven together; marginal part of exciple cortex up to 25 µ thick, pseudoparenchymatous, cellular lumina subglobose or ovoid, only 2.5-3 µ thick, membrane thick, parathecium well developed, +/- thickened above. Hymenium (thecium) circa 75 µ tall, red-dark brown/grayish-brown, I subpersistently bluish or eventually dirty reddish. Paraphyses circa 1 µ thick, not or barely thickened above (neither clavate nor capitates), tightly conglutinate. Asci inflated-clavate. Spores 8, ovoid, 10-14 µ long, 6.5-8 µ thick, apices rounded on both sides, membrane slightly thickened. Spermogonia immersed, maculae revealed to be blackish, conceptacle hyaline; spermatia arcuate, 17-22 µ long, 0.5-0.8 µ thick.
Ins. Tajmyr, Port Actinia (on wood).
Seemingly allied with previous (L. caesiosulphurea), but reactions, apothecial thalline margin soon or at least eventually excluded etc. distinct.