Description: Primary thallus squamulose, the squamules persistent or evanescent, small (1-3 mm long, 0.5-1.5 mm broad), indented, greyish green to brownish above, white below, sometimes sorediate. Podetia elongate, hollow inside, grey to grey-brown, rarely melanotic at base, corticate only at base, non- or scarcely squamulose, 1-3(-6) cm tall, 2-6 mm thick, unbranched or sparingly branched in upper part, farinose-sorediate in upper part (soredia 17-50 μm in diam.), with narrow, irregular, perforated funnels, the margins often toothed and usually inrolled toward the perforation. Apothecia very rare, brown, convex, mostly marginal on cups. 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 frequent, on the margins of funnels, cylindrical, with a reddish jelly. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV+ white. Chemistry: squamatic acid in thallus, barbatic acid in apothecia, occasionally traces of thamnolic acid.
Note: a temperate to boreal-montane, circumpolar species found on rotting wood, mainly on old stumps, and on soil rich in humus, with a wide altitudinal range.
Growth form: Fruticose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)