A crustose lichen with a chocolate brown, often violet-tinged, thin to thick thallus and a dark prothallus that forms extensive mosaics. Scattered across the surface are punctiform soralia with dark brown soredia, that leave pale areas when abraded.
Soredia: C-, K-, UV+ deep blue
In Scotland Enterographa zonata is widespread beneath damp and deeply shaded, siliceous rock overhangs. BLS distribution map
scottishlichens.co.uk 