This is a crust forming lichen with an uncracked matt white or pale grey thallus which becomes pitted with dark holes.
On hard limestone rocks and memorials and on mortar.
All year round.
Common and widespread.
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
Enter a town or village to see local records
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015