Teloschistaceae Caloplaca ceracea Growth type crustose Chemical results: Thallus K-, apothecia K+ red Usually coastal on shaded siliceous rocks, rare inland. Areolate pale grey thallus, prothallus paler or absent, the orangish to rusty brown convex apothecia becoming greener when wet. The disc and paler, matt margins are sometimes pruinose. Similar: C. crenularia. Shiny margins, discs remaining orange when wet

Caloplaca ceracea
Redhorn Bay, Studland, Dorset. June 2015