Flavoplaca marina forme avec cyanobactéries

= Caloplaca marina forme avec cyanobactéries.

    Rather common, differs from the type by its thallus, blackish towards the center, owing to the development of black cyanobacteria, acting as parasites and destroying the underlying thallus, restricted to an external ring. Apothecia, seldom parasitised, are less numerous. Common on highly exposed, humid and slightly acidic substrates.