Description: This spreading species is currently blazing a trail across Ireland and turning wayside trees in our towns and cities yellow. The minutely foliose thallus with fan-like lobules that are sorediate can interlock to produce overlapping tiers that spread to form extensive colonies. Discs are common, orange-yellow with a paler margin. It is already well established in Ireland in suitable habitats.

Key Identification Features:

• The minute lobes of delicate design appear to interlock as they grow. Unlike similar yellow coloured lichens (for example, Xanthoria species) this species is K-
• A rapid coloniser and possible indicator of the spread of global warming.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Candelaria concolor at iNaturalist World Species Observations database.