Description: Thallus crustose, thinly episubstratic, grey to pale grey-brown, often inconspicuous and poorly evident. Apothecia scattered, urceolate, usually immersed, later sometimes becoming sessile, 0.1-0.3(-0.5) mm across, with a deeply concave, pale yellow-brown to ochraceous disc, and a prominent, smooth to (rarely) radially cracked, creamy to brownish or yellowish pink proper margin. Proper exciple colourless, c. 50 µm thick laterally, 10-20 µm wide at base; epithecium colourless, with orange-brown granules insoluble in K; hymenium colourless, inspersed with oil droplets, 100-120 µm high; paraphyses slightly longer than the mature asci, septate, capitate, the apical cells up to 3-4 µm wide; hypothecium colourless. Asci 8-spored, cylindrical to elongate-clavate, thin-walled, lacking an apical apparatus or tholus, K/I+ blue. Ascospores muriform, hyaline, citriform with pointed ends, 12-18 x 7-10(-12) µm. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on bark of ancient trees in humid, sheltered situations in lowland areas; mostly Tyrrhenian and somehow coastal. The species is included in the Italian red list of epiphytic lichens under the “Least Concern” category (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)