Description: C. maritima is a rather localised species that tends to be scattered rather than abundant in particular habitats. It is close to C. marina (described elsewhere) but differs in the golden yellowy-orange to pale yellow thallus and the uneven, knobbly or pustule-like areoles (which resemble blown render on a wall) that peter out towards the margin. Discs are abundant. Look for it on rocks, vertical sea walls (siliceous and mildly basic) and worked timber towards the back of dune systems, saltmarsh and low sea cliffs. In Ireland: north-east and north-west.

Key Identification Features:

• Like C. marina but pale, egg-yolk yellow, with scattered, raised or pustular areoles
• Higher up the shore than other coastal Caloplaca species and often some distance from the sea along estuaries and creeks.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Flavoplaca maritima at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Flavoplaca maritima at iNaturalist World Species Observations database.