Distribution: N - VG (TSB 6529), Lomb, Piem, Lig. C - Laz (Nimis & Tretiach 2004), Sar. S - Camp (Nimis & Tretiach 2004), Pugl, Cal (TSB 6948), Si (Nimis & al. 1994).
Description: Thallus foliose, homoiomerous, gelatinous when wet, forming 3(-5) cm wide rosettes, deeply lobed. Lobes radiating, elongated, 2-6 mm wide, 0.4-0.5(-0.6) mm thick (when wet), contiguous, adpressed for most of their length, ascending towards the center, often channeled towards apices, the tips much swollen and plicate. Upper surface dark brown, dull, sometimes with globose isidia. Lower surface usually paler, with tufts of white hapters. Apothecia often present, but less abundant than in the typical subspecies, mainly marginal, sessile to stipitate, 1-3 mm wide, with a plane to slightly convex, red-brown disc and a rather thin thalline margin. Proper exciple rather thin, subpara- to small-celled (up to 8.5 µm) euparaplectenchymatous; hymenium hyaline, 65-106 µm tall. Asci 8-spored, subcylindrical to narrowly clavate, the apex thick, with a I+ blue apical dome and a I+ blue annulus projecting downwardly. Ascospores 3-septate, hyaline, broadly fusiform, pointed at at least one end, (18-)20-26(-28) x (5-)6-9(-10) µm, Pycnidia laminal or marginal, immersed in warts, globose, pale. Conidia straight or slightly curved, bacilliform, usually with swollen ends, 5-7 x 1-1.5 µm. Photobiont cyanobacterial (Nostoc), in long chains. Spot tests: all negative. Chemistry: without lichen substances.
Note: more thermophytic and more southern than the typical subspecies, this taxon is worthy of further study.