Description: This yellow-green crustose species will grow on nutrient-enriched siliceous rocks and walls inland as well as near the sea, often parasitizing other lichens. It has a cracked, warted, rather thick thallus with olive yellow discs (to 1.5mm diam.), that can darken to pink or brown, sometimes appearing glazed over. It is common in suitable habitats throughout Ireland.

Key Identification Features:

• The thick, cracked, yellowish thallus lacking soralia helps to distinguish it from Lecanora orosthea which is a similar colour, but is always sorediate (dusty)
• The dark nature of some of the older fruits is distinctive.

Original text submitted by Simon Davey

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

iNaturalist: Lecanora sulphurea at iNaturalist World Species Observations database.