Distribution: N - Frl, Ven (Tretiach 1993), TAA (Brackel 2013, Nascimbene & al. 2022), Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999).
Description: Thallus fruticose, filamentous, ascending to decumbent, rigid, pinkish grey to pale grey brown at the base, dark grey-brown to black at apices, dull, forming large, loosely attached entangled mats, the branches 0.5-1(-1.5) mm thick, anisotomic-dichotomously divided, to 8(-10) cm long, subterete, becoming flattened at the base. Pseudocyphellae abundant, slightly raised, fusiform to linear, to 1.2 mm long; medulla white, rather compact. Apothecia extremely rare (never found in Italian material), zeorine, to 2 mm across, with a brown disc. Asci 2-(-4)-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores, 1-celled, broadly ellipsoid, first hyaline, later reddish brown, 20-40 x 12-25 μm. Photobiont chlorococcoid. Spot tests: medulla K+ faintly yellow to reddish, C+ red, KC+ red, P+ yellowish. Chemistry: alectorialic acid and usually barbatolic acid.
Note: an arctic-alpine, circumpolar species found on bare ground or on siliceous rocks in wind-exposed ridges, mostly in moss-lichen heaths above treeline. Restricted to the Alps in Italy.
Growth form: Fruticose filamentous
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by thallus fragmentation