Distribution: N - TAA (Dalla Torre & Sarnthein 1902).
Description: Primary thallus squamulose, persistent, the squamules thin, 0.2-0.3 mm wide, to 3 mm long, entire to crenate-lobate, yellowish above, sorediate. Podetia bright yellowish green, to 20 (-25) mm tall but usually shorter, simple, slightly corticated only at the base, otherwise densely farinose-sorediate, cupless or more rarely with very narrow cups. Apothecia rare, pale brown. Asci 8-spored, clavate, thickened at apex, with a K/I+ blue tholus and a K/I+ strongly blue outer gelatinous sheath, Cladonia-type. Ascospores 1-celled, hyaline, ellipsoid. Pycnidia on primary squamules or at tips of podetia, ovoid to cylindrical, with a colourless jelly. Conidia baciliform. Spot tests: K-, C-, KC+ yellow P-, UV-. Chemistry: usnic and barbatic acids.
Note: a boreal-montane, mainy lignicolous species, also known from the French, Swiss and Austrian Alps, probably more widespread also along the Italian Alps, in montane to subalpine coniferous forests.
Growth form: Fruticose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)