Distribution: N - Frl, TAA (Thor & Nascimbene 2007, Nimis & al. 2015). C - Umb (Ravera 1998, Ravera & al. 2006), Laz (Ravera 2001, Stofer 2006), Sar (Zedda 2002, 2002b). S - Pugl (Nimis & Tretiach 1999), Bas (Puntillo & al. 2012), Cal (Puntillo 1995, 1996).
Description: Thallus crustose, endosubstratic, whitish or pale greenish grey, thin, smooth, ecorticate. Perithecia black, 0.3-0.6 mm across, half-immersed, the projecting part hemispherical. Involucrellum brown-black, completely surrounding a globose, colourless or pale brownish exciple; hamathecium of persistent, slender, sparingly branched, long-celled pseudoparaphyses, periphyses absent; hymenial gel I-, K/I-. Asci 8-spored, cylindrical, K/I-, fissitunicate, the apical dome with a broad ocular chamber surmounted by a hemispherical meniscus-like structure. Ascospores 1-septate, hyaline, ellipsoid with rounded ends, (9-)11-16.5 x 5-9.5 μm, uniseriately arranged in the asci, surrounded by a perispore which appears verrucose in water, smooth in K. Pycnidia unknown. Photobiont trentepohlioid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate, incompletely holarctic species of smooth bark in humid deciduous forests. Rare throughout the country, but most frequent in Tyrrhenian Italy.
Growth form: Crustose
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)