Thallus spreading in patches, 3-10 cm diam. Upper surface pale glaucous or greenish-grey to whitish-buff, granular-leprose, scurfy or furfuraceous, thin, eroded-effuse in parts, white-arachnoid at margins. Apothecia very small, 0.1-0.3 mm diam., numerous, scattered, rarely solitary 2-6(-10) aggregated, innate to ± sessile, disc round to irregular, concave to plane, pale yellow-brown to reddish, translucent, densely white-pruinose, pruina fine, delicately farinose, margins slightly raised, entire, erumpent, densely white farinose-sorediate, macroscopically visible as pale whitish blotches on thallus. Ascospores fusiform, 7-septate, slightly curved (40-)45-62(-72) × 5-6(-7) µm. Chemistry: Cortex K+ yellow. Stictic and constictic acids and unidentified compound A.