Description: Thallus fruticose, shrubby-coralloid, 3-5 cm high, often forming extensive mats; branches highly divided in upper part, flattened towards the base, ending with small, subterete, palmate branchlets, pale greenish to greenish grey, sometimes partly pinkish brown, the surface smooth or transversally cracked in old branches. Apothecia rare, developing on the underside of larger, terminal, fertile branches, 1.5-3.5 mm across, globose, with a black mazaedium. Thalline exciple soon excluded. Asci cylindrical, with uniseriately arranged spores, disintegrating before the spores are mature. Ascospores subglobose, at first hyaline, then pale to dark grey, 7-9 µm in diam. Pycnidia terminal, black to brown. Conidia bacilliform to rod-shaped, 3-8 µm long. Photobiont: chlorococcoid. Spot tests; medulla K+ yellow, C-, KC-, P+ orange, UV+ blue-white. Chemistry: sphaerophorin and stictic acid complex, the latter most abundant in the apothecia.
Note: a rare and declining humid subtropical to mild-temperate species found on mossy bark and rocks in very moist forests.
Growth form: Fruticose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)