Distribution: N - TAA (Dalla Torre & Sarnthein 1902).
Description: Thallus crustose, thinly episubstratic, grey-white to greenish white, slightly shiny, continuous, finely rimose to verrucose, without a distinct prothallus. Apothecia biatorine, round to irregular in outline, slightly constricted at base, 0.2-0.5 mm across, with a an orange brown, pale grey, bluish grey, brown-black or red-black, flat to convex disc, and a distinctly paler, glossy, finally excluded proper margin. Proper exciple of radially arranged hyphae, colourless or dirty brown to greenish brown in innermost part, without crystals; epithecium poorly differentiated from the hymenium, without crystals; hymenium pale olive-green to greenish brown, the upper part more or less colourless to pale olive-green, 60-75 μm high, I+ blue, K-, N-; paraphyses conglutinated and tightly adhering to the asci, mostly simple, not or only slightly thicker at apex (c. 3-4 μm); hypothecium colourless in lower part, olive-green to dirty brown in upper part, 75-100 μm high, K-, N-. Asci (8-)12-16-spored, with a thin, cylindrical axial mass. Ascospores 1-celled, hyaline, ellipsoid, 6-12(-14) x 2.5-4(-5) μm. Photobiont chlorococcoid. Spot tests: thallus K- or K+ pale yellow-orange, C-, KC-, P-. Chemistry: unknown.
Note: a boreal-montane species found on acid bark and lignum, often also pioneer on young deciduous trees and shrubs such as Vaccinium spp. or on thin twigs of Picea abies in upland areas. The generic position is still not clear.