A crustose lichen with a grey to yellowish grey, thick, warted thallus. Yellowish grey to yellow-green soralia are scattered over the surface and sometimes become confluent. When present, apothecia have flat, flesh-coloured to tan discs with a pale, smooth or sorediate, entire margin.
Cortex: C+ red, K-, UV-
In Scotland, Ochrolechia androgyna is widespread on siliceous rocks and acid-barked trees where it often grows over mosses and other lichens. BLS distribution map
scottishlichens.co.uk 