Distribution: S - Camp (Puntillo & al. 2000, Puntillo 2000), Bas (Puntillo & al. 2012), Cal (Puntillo 1995, 1996, 2000, Puntillo & Puntillo 2004).
Description: Thallus crustose, thinly episubstratic, ecorticate, grey-green, minutely granulose-coralloid, consisting of 50-65 μm wide, at first globose, then elongated goniocysts. Apothecia biatorine, constricted at base, 0.2-0.8 mm across, yellow-orange to orange-red, with a flat to convex, epruinose disc, and a weakly prominent, finally excluded proper margin. Proper exciple paraplectenchymatous, without crystals, of very thin-walled (0.5-1 μm), not distinctly radiating hyphae, mostly colourless. Epithecium colourless or pale green, indistinctly delimited from the hymenium, K-, N-; hyrnenium mostly colourless, 45-75 μm high; paraphyses mostly simple, 1-1.5 μm thick at mid-level, the apical cells clavate or only slightly thickened, up to 5 μm wide; hypothecium poorly developed, colourless to straw-coloured. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass) never penetrating through the entire d-layer, the wall K/I-, but the thin outer gel K/I+ blue, Bacidia-type. Ascospores 3-7-septate, hyaline, needle-like, (30-)35-45(-50) x 0.8-1.5(-2) μm. Photobiont chlorococcoid, the cells 5-12(-14) μm in diam. Spot tests: thallus and apothecia K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mild-temperate to humid pantropical species described from the Caucasus and also known from the Pyrenees, with granular to subcoralloid thallus, hemisphaerical whitish apothecia, and mostly 3-septate acicular ascospores, found in the understory of forests, mostly on twigs and leaves of Buxus. In Italy it is restricted to warm-humid situations and undisturbed stands of the Tyrrhenian region, mostly in the Mediterranean belt. The species is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c), but it is easy to overlook and it could be somehow more widespread.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)