A placodioid species that is matt orange, though often has a white zone behind the apices, that often forms large, even, circular patches. The lobes are long, narrow, smooth, convex, and only slightly wider at the apices. The centre of the thallus may be almost areolate, but it often falls out. Apothecia are usually crowded in the centre of the thallus.
All parts: K+ purple
In Scotland, Caloplaca flavescens is a species that becomes rarer further north. It can be found on hard, calcareous rocks along the coast and further inland. BLS distribution map
Caloplaca flavescens is distinguished from Caloplaca thallincola on basis of its matt appearance and the lobes being extended less far towards the centre of the thallus.
scottishlichens.co.uk 