Caloplaca holocarpa

Thallus greyish to yellow or orange but usually poorly developed or almost absent, often as rather amorphous material just around the apothecia, soredia absent; apothecia dispersed to somewhat crowded, of mixed sizes, orange-yellow to deeper orange, thalline exciple scarcely developed but 'proper' margin relatively thick and conspicuous when young, much less visible as the apothecia mature and become convex.

On sandstone and other siliceous rocks, on walls and on concrete.

All year round.

Widespread and generally common.

Fairly frequent in Leicestershire and Rutland.