Distribution: N - Frl (Tretiach & Carvalho 1995), Ven.
Description: Thallus crustose, episubstratic, whitish to greenish grey, thin, mostly continuous and smooth or sometimes thinly rimose. Apothecia lecanorine, sessile, 0.4-0.8 mm across, with a concave to flat, red-brown to pinkish brown, whitish-pruinose disc, and a white-pruinose, irregular thalline margin. Proper exciple thin, brown; epithecium brown, with dense crystals, K-; hymenium colourless; paraphyses sparingly branched, easily separated, not markedly swollen at apices; hypothecium colourless. Asci 8-spored, with an uniformly amyloid apical dome. Ascospores (1-)3-septate, hyaline, spirally arranged in the asci, 30-35 x 5-6 µm. Photobiont chlorococcoid. Spot tests: thallus K+ bright yellow, C-, KC-, P+ orange, Chemistry: thamnolic acid.
Note: a cool-temperate, suboceanic lichen found on mature trees (mostly Abies) in humid, old forests, mostly in the montane belt. It is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).