Description: This is a green-black, crustose species occurring on siliceous maritime rocks in the mid- to high-tide mark on rocky coasts. The thallus is distinctive in its cover of black dots and ridges which gives the surface a rough texture. It is frequent in suitable coastal habitats throughout Ireland.

Key Identification Features:

• The combination of dark ridges and tiny black dots on a green-black thallus immediately suggests this species
• Verrucaria amphibia is blacker with ridges but lacks the dot matrix that gives the thallus its surface texture.

Original text submitted by Simon Davey

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

iNaturalist: Wahlenbergiella striatula at iNaturalist World Species Observations database.