Description: Thallus crustose, pale grey to whitish, very thin, continuous to small-verrucose. Apothecia frequent, biatorine/zeorine, sessile, constricted at base, 0.5-1(-1.5) mm across, the disc rusty red to brownish black in sun-forms, flat to finally convex, with a roughened surface, the proper margin rather thick, smooth, persistent, often undulate-crenulate with age, sometimes slightly paler than disc; a grey thalline margin is usually visible on the underside of the apothecia. Proper exciple prosoplectenchymatous; epithecium orange-brown, granular, K+ red, C+ purple in section; hymenium colourless, not inspersed with oil droplets, 70-85 μm high; paraphyses coherent, simple or sparingly branched and anastomosing, 1.5-2(-3) μm thick in lower part, the apical cells only slightly wider; hypothecium colourless. Asci 8-spored, clavate Teloschistes-type. Ascospores 1-septate, polarilocular, hyaline, ellipsoid, sometimes slightly curved, (11-)13-16(-18) x (5-)6-8(-9) μm, the septum 3-5(-7) μm thick. Pycnidia orange-red, immersed. Conidia bacilliform, rarely narrowly ellipsoid, 3-5 x 1-1.5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecia K+ red, C+ red (in section). Chemistry: thallus without lichen substances; chlorinated anthraquinones in both apothecial disc and exciple; Cinereorufa-green only in traces.
Note: a mainly arctic-alpine to boreal-montane, bipolar lichen found on terricolous mosses and plant debris, more rarely on decaying, rather soft lignum or on small shrubs (Vondrák & al. 2020), most frequent above or near treeline (Alps, N- and C-Apennines).