Description: Thallus crustose, episubstratic, pale green, grey-green or yellow-green, sometimes brown-spotted, granular, the granules 50-120 µm wide, sometimes isidioid, often browned in upper part. Apothecia lecideine, orange-brown to dark purplish brown, sometimes almost black, rounded, sessile and constricted at base, (0.5-)0.7-1.5 mm across, with a flat disc and a thick, smooth, raised, finally sometimes excluded proper margin. Proper exciple orange-brown to dark red-brown in outer part, paler within, the pigmented parts K+ purple; epithecium brown to orange-brown, K+ purple; hymenium colourless, 80-90 µm high; paraphyses 0.8-1.6 µm thick at mid-level, the apical cells up to 4 µm wide, without internal pigment; hypothecium colourless to very pale yellow. Asci 8-spored, clavate, surrounded by a gelatinous I+ blue coat, with a well-developed I+ blue tholus, a I+ darker blue tube and a well-developed ocular chamber, Bacidia-type. Ascospores 9-16(-22)-septate, hyaline, needle-like, twisted in the asci, (45-)60-75(-85) x 2.5-3(-4) µm. Pycnidia rare, pale orange. Conidia thread-like, curved, 9-16 x c- 0.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances; i>Laurocerasi-brown pigment in epithecium, proper exciple, and pycnidial wall. Rubella-orange pigment in epi- and hypothecium, proper exciple, and pycnidial wall.
Note: a rare, oceanic species growing on trunks of mature deciduous trees (often oaks) in old woodlands, mostly in Lobarion-communities. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).