Verrucaria hochstetteri
Description
The thallus is variably pale grey to grey-green or even red-tinged. It has large, completely immersed perithecia (to 0.8mm diam) which leave conspicuous pits in the substrate when they decay.
Identification difficulty

Habitat
On suitable limestone habitats, including man-made structures .
When to see it
All year round.
UK Status
Common and widespread in Britain.
VC55 Status
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015