Verrucaria nigrescens
Description
Forms a cracking crust. It is dark brown to black, greener when wet.
Identification difficulty

Habitat
On calcareous rocks, mortar, cement and stonework, including limestone memorials and gravestones.
When to see it
All year round.
UK Status
Widespread and fairly common in Britain.
VC55 Status
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
Enter a town or village to see local records
MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015