Description: This crust of town and country calcareous rock habitats can form large spreading patches. It is most closely related to V. nigrescens but, unlike that species, it has a pale greyish-green to a darker grey-brown appearance. Examination with a hand lens will reveal that the rounded discs (perithecia) are almost completely immersed in the thallus. It grows well on man-made substrata.

Key Identification Features:

• The green-brown to grey colour of the thallus
• Discs, almost completely immersed.

Original text submitted by Simon Davey

Distribution Map from NBN: Verrucaria viridula at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Verrucaria viridula at iNaturalist World Species Observations database.