Description: Look for this crustose species on sheltered rocks and outcrops (especially basalt) near the coast. The green-grey, K+ bright golden-yellow thallus can become rather thick, uneven and verrucose, supporting soralia that are scattered and greenish-yellow. To most observers, it is the greenish-yellow colour which draws the attention. In Ireland, the species has been recorded from the north and west, only a short distance from the sea.

Key Identification Features:

• Thick, verrucose thallus covered with greenish-yellow soralia; K+ bright golden yellow, C-
• On vertical rock faces near the coast, for example, basalt.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Coccotrema citrinescens at iNaturalist World Species Observations database.