Description: Thallus crustose, episubstratic, whitish to ash-grey, areolate or granulose-verrucose, with convex, to 1 mm wide areoles. Apothecia lecideine, black, adnate to sessile, often confluent, 0.4-1(-1.5) mm across (to 2.5 mm when apothecia confluent), with a soon convex, pruinose disc, and an indistinct, soon excluded proper margin. Proper exciple thin, blue-green, of radiating hyphae, K-; epithecium bright blue-green, K-; hymenium colourless to weakly blue-green in upper part, 50-100 µm high, K-; paraphyses coherent, not thickened at apex; hypothecium thin, brown-orange and K+ purple-red in lower part. Asci 8-spored, distinctly thickened at the apex, with a I+ blue tholus, the outer gelatinous coat I+ pale blue, approaching the Bacidia-type. Ascospores 1-celled (rarely a few 1-septate), hyaline, narrowly ellipsoid, 13-21(-25) x 2.5-4 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a circumpolar, arctic-alpine lichen found on naked soil, mosses and plant debris over siliceous substrata, more rarely on bark, on basal parts of conifers in the subalpine belt. Systematic position and delimitation of this species are still not clear (see Printzen 1995); it might belong to Protomicarea.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris