Family: Verrucariaceae
Verrucaria fusconigrescens Nyl.
Type: Crustose
Mid to dark brown areolate thallus, with a dark brown to black prothallus. Largely coastal in the north and west, away from the splash-zone. Mainly on siliceous rock
References:
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Irelandd