A crustose species with a thick, warted thallus that is lead-grey with often a noticeably yellow tinge. The usually abundant apothecia are urceolate and have a black disc that is white-pruinose. The thalline margin is raised above the thallus.
Thallus: C+ red, K+- yellow, UV-
In Scotland, Diploschistes scruposus is widespread, except for the northern parts of the Highlands. It is found on siliceous or somewhat basic rocks, especially where nutrient-enriched. BLS distribution map
scottishlichens.co.uk 