Description: Thallus crustose, thinly episubstratic, ecorticate, subleprose-granulose, greenish to whitish, consisting of 50-80 µm wide goniocysts. Apothecia frequent, rounded and strongly constricted at base, 0.4-0.5(-0.7) mm across, with a grey-brown, violet-brown or blue-black, flat to finally strongly convex disc, and a paler, finally excluded, byssoid proper margin. Exciple of polyhedral to rectangular cells in lateral parts, paraplectenchymatous below the hypothecium, 60-80 µm wide laterally, 100-110 µm wide in basal part; epithecium colourless to pale brown; hymenium colourless, I+ blue; paraphyses coherent, simple or furcate, 1.5-2 µm thick at mid-level, the apical cells slightly swollen; hypothecium brownish, K+ purple-brown, 100-160 µm thick. Asci 6-8-spored, cylindrical-clavate, with a distinctly I+ blue tholus, but without internal structures. Ascospores 12-14(-16)-septate, hyaline, filiform-cylindrical, slightly tapering at one end, 40-60 x 2.5-3.5 µm, sometimes breaking into part-spores when ejected from asci, without a perispore. Pycnidia usually present, flask-shaped, <0.1 mm across, pale ornge to blackish blue, usually wih hyaline hairs on the outer wall, the ostiole often filled with a conidial mass. Conidia clavate to bifusiform, 3-4 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.
Note: a humid subtropical lichen found on leaves of evergreen trees and shrubs in very humid, warm situations, known from France, Madeira, the Canary Islands, and from a single station in Italy; for further details see Sérusiaux & al. (2002). The species is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).