Description: Thallus crustose, inconspicuous, thin, pale grey to whitish. Apothecia 0.2-0.4 mm across, gelatinous and translucent when wet, with a concave to flat, orange disc and a usually darker, orange-brown, raised, smooth proper margin. Proper exciple well-developed, of narrow, thin, compacted hyphae; epithecium orange-brown; hymenium colourless; paraphyses simple, septate; hypothecium colourless. Asci 16-48-spored, thin-walled, lacking an apical apparatus or tholus, K/I+ blue. Ascospores transversely 7(-9)-septate, hyaline, acicular, strongly curved and spirally arranged in the asci, 35-60 x 2-3 µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a rare species found on bark of broad-leaved trees in montane forests, widespread in temperate Europe, including the Alps outside Italian territory, and also reported from the Mountains of Greece and from C-Asia. To be looked for in Italy.