Description: Thallus crustose, inconspicuous, thin, pale grey to whitish. Apothecia 0.4-0.6 mm across, usually numerous, urceolate, gelatinous and translucent when wet, with a concave, orange or reddish brown to finally dark brown disc, and a thick, raised, smooth proper margin which is sometimes surrounded by a spurious, crenulate, pale pseudothalline margin. Proper exciple well-developed, of narrow, thin, compacted hyphae, reddish brown in outer part, pale within; epithecium reddish brown; hymenium colourless, I+ pale blue; paraphyses mostly simple, septate, more or less hooked at tips; hypothecium colourless. Asci (8-)16-48-spored, thin-walled, lacking an apical apparatus or tholus, the wall K/I+ blue. Ascospores transversely 9-15-septate, hyaline, acicular, straight to slightly curved, 38-85 x 3-6 µm, with pointed ends. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate species found in old, humid forests; very much declining, especially in northern Italy. It is included in the Italian red list of epiphytic lichens as “Near-threatened” (Nascimbene & al. 2013c).
Growth form: Crustose
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)