A crustose species with a yellow-orange to deep orange thallus that consists of small lobules or is cracked-areolate. When well-developed it has small, irregular areoles with slight marginal lobes and often with black stains in between. Apothecia are deep reddish orange.
All parts: K+ purple
Caloplaca marina can be found along the entire Scottish coastline where it is common on well-lit, hard maritime rocks in the upper part of the littoral zones. BLS distribution map
Calopaca marina is often found alongside Hydropuncataria maura and Caloplaca thallincola.
scottishlichens.co.uk 