• Verrucaria viridula (Schrad.) Ach.
Verrucaria viridula
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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 characteristics

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

Original text submitted by Simon Davey

 Simms, M. J., (2016). Verrucaria viridula (Schrad.) Ach.. [In] LichenIreland. Accessed on 2018-07-19.