Chrysothrix candelaris  

Thallus leprose, thin, diffuse (rarely delimited), of scattered, tiny, granular soredia or producing a continuous, non-areolate, vivid bright yellow crust, often with a golden or green tinge. Prothallus conspicuous. Soredia 100-300 µm diam., minutely convex to globose, woolly textured.
Anamorph: no information available.
Teleomorph: not known in GBI; ascomata apothecia, minute, to 0.5 mm diam., ± superficial, rounded or distorted angular, flat to slightly convex, at first surrounded by a very thin, non-corticate margin. Disc smooth, pale orange, often yellow-pruinose. True exciple poorly developed, to 10 μm thick, entire, smooth, concolorous and sometimes obscured by the thallus, becoming excluded as the apothecia mature.
Chemistry: thallus C–, K and KC± orange, darkening to red-black, Pd± orange, UV– (calycin or pinastric acid, rarely both).