Description: Thallus crustose, often almost entirely hidden in the substrate, sometimes thinly episubstratic and rimose-cracked, appearing as a greyish white to olive brown patch. Medulla non-amyloid. Apothecia lecideine (0.1-)0.2-0.3(-0.5) mm across, soon sessile, with a black, epruinose, first flat then soon convex disc, and a thin, soon excluded proper margin. Proper exciple narrow, poorly differentiated, dark in outer part; epithecium brown; hymenium colourless, 35-60 µm tall, not inspersed with oil droplets; paraphyses simple to moderately branched, apically swollen, with a brown pigment cap; hypothecium brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, soon brown, ellipsoid with obtuse ends, not constricted at septum, 6-10(-12) x 2.5-4(-4.5) µm, not ornamented. Pycnidia often numerous, globose, unilocular. Conidia very short, oblong to elliptical, some of them almost globose, 1.5-3 x 0.5-1(-1.4) µm. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: no lichen substances.
Note: a mainly cool-temperate to boreal-montane, circumpolar species found on acid bark, especially of conifers, and on wooden poles in upland areas, to be looked for further in the mountains of southern Italy.