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.
A lichen of freshwater habitats where it can be found submerged and normally on siliceous (acid) rocks.
All year round
An early coloniser of suitable areas.
Widespread, but with records suggesting a mainly northerly and westerly distribution in Britain. It is the most common of the freshwater Verrucaria species.
Occasional in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015