Verrucaria aquatilis
Description
The thallus of this aquatic lichen is grey-brown to dark green and forms a thin and smooth crust. Many black warts (perithecia) are scattered over the surface.
Identification difficulty

Habitat
A lichen of freshwater habitats where it can be found submerged and normally on siliceous (acid) rocks.
When to see it
All year round
Life History
An early coloniser of suitable areas.
UK Status
Widespread, but with records suggesting a mainly northerly and westerly distribution in Britain. It is the most common of the freshwater Verrucaria species.
VC55 Status
Occasional 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