Caloplaca holocarpa sensu lato

Description

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.

Caloplaca is one of a number of similar taxa which show a wide variation in morphology. Usually C. holocarpa has smaller and more orange-red apothecia but given the variation we have included all records of this species as Caloplaca holocarpa sensu lato  (ie "in the broadest sense").
Identification difficulty
Habitat

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

When to see it

All year round.

UK Status

Widespread and generally common.

VC55 Status

Fairly frequent in Leicestershire and Rutland.

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Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map