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.

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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