Description: This is a small (to 2cm wide) orange-pink, crustose species with a lobed margin. It is frequent on walls of calcareous stone, but less easily seen on limestone outcrops. The splayed lobe tips are paler than the centre of the thallus which is crowded with discs. The lobes are powdered with pruina. It has a similar ecology to Caloplaca flavescens, but prefers dry underhangs and sheltered rock. It has a scattered distribution in Ireland; on walls, churchyard memorials and ruined buildings.

Key Identification Features:

• The small size of the thallus, pruinose lobes, pinker colour and preference for sheltered situations should distinguish it from lookalikes
• There are few species in Ireland with which it could ever become confused.

Original text submitted by Simon Davey

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

iNaturalist: Calogaya pusilla at iNaturalist World Species Observations database.