Description: Surprisingly rare in Ireland, this lichen is a character species of nutrient-rich boundary trees. The grey, granular thallus has a distinctive green cast (best seen by stepping back from the tree to view) and numerous large, flat discs (>1mm diam.) with generously notched margins. In Ireland it has been recorded from Counties Cork, Laois, Offaly, Kildare and Fermanagh with earlier records from Counties Galway and Waterford. It is probably much overlooked.

Key Identification Features:

• A species of large, old, rough-barked, boundary trees; thallus grey with a green glow
• Discs, large, flat, with a wrinkled and notched margin, K+ yellow; spores, thick-walled.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Rinodina roboris at iNaturalist World Species Observations database.