Distribution: N - Lig. C - Laz (Ravera & al. 1999, 2000, Munzi & al. 2004, 2007). S - Camp (CLU 17151), Bas (Bartoli & Puntillo 1996, 1998), Cal (Sérusiaux 1998).
Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous, minutely granulose to verrucose, olive-green to glaucous green. Apothecia biatorine, adnate, clearly constricted at base, round, 0.12-0.25(-0.35) mm across, pale to medium orange-brown, with a concave to flat disc, and a usually somewhat darker, persistent, smooth proper margin. Proper exciple paraplectenchymatous, orange-brown in outer part, colourless within, composed of globose to angular cells with an outer layer of weakly vertically oriented hyphae; hymenium colourless, (90-)100-120 µm high, I+ blue, then rapidly dirty green and finally red-brown; paraphyses simple or sparingly branched in upper part, the apical cells swollen; hypothecium colourless, poorly developed. Asci 8-spored, unitunicate, thin-walled, narrowly cylindrical, without an amyloid ring around the apical pore, Catillaria-type, with uniseriate ascospores. Ascospores 1-septate, hyaline, narrowly ellipsoid, (8.5-)10-12(-16) x 2.5-4 µm. Pycnidia not known. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate lichen found on acid bark of conifers and broad-leaved trees in open, humid and warm Mediterranean woodlands; strictly Tyrrhenian in Italy. It is included in the Italian red list of epiphytic lichens as “Vulnerable” (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)