Description: Thallus fruticose, filamentous, attached by a basal holdfast, long-pendent, soft, to 60 cm long, pale brown to dark brown in sun-exposed morphs, the main branches to 4 mm thick, often twisted and foveolate, the secondary branches much thinner, sometimes with perpendicular side branchlets. Soralia absent to abundant, yellowish, tuberculate, with farinose soredia. Pseudocyphellae sparse to abundant, elongate to fusiform, white or bright yellow. Apothecia extremely rare (never observed in Italian material), zeorine, with a brown disc covered with a yellow pruina, to 2 mm across. Asci 8-spored, Lecanora-type. Ascospores 1-celled, hyaline, subglobose, 5-8 x 4-5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: vulpinic acid, often limited to the soralia, rarely barbatolic and norstictic acid in traces.
Note: a cool-temperate to boreal-montane, easily recognizable species found on twigs of conifers in damp montane to subalpine forests. It is included as “Regionally Exctinct” in the Italian red list of epiphytic lichens (Nascimbene & al. 2013c).
Growth form: Fruticose filamentous
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)