Thallus foliose, lobate, to 4 cm diam., corticolous. Lobes broad, to 5 mm wide, short, margins ascending sometimes strongly involute and crenate, developing prominent, bluish, limbiform soralia on the edges of the upturned lower surface, soredia coarse, granular, greyish-blue, often trapped on the tomentum of the upper surface and thus becoming spread superficially over the lobes. Upper surface greyish-brown, finely tomentose, tomentum rather variable in appearance and texture from a uniform, thin, whitish bloom to a long (12 mm), buff or yellowish, tangled or loosely-woven mat. Lower surface white or pale cream, not distinctly yellow, lower cortex and veins absent. Rhizines blue-black, simple to squarrosely branched, to 3 mm long, restricted to margins where they form small, dense tufts. Apothecia not seen.