Description: Forms rather smooth, often circular, green patches with a white margin. A conspicuous crustose lichen low in the littoral zone. Typical of rather sheltered habitats.

Key Identification Features:

• Circular smooth green thallus.
• White margin to thallus.
• Exclusively marine. On sheltered rocks low in the littoral zone.

Original text submitted by Michael J. Simms

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

iNaturalist: Wahlenbergiella mucosa at iNaturalist World Species Observations database.