A crustose species with a distinctive bright green or green-grey, warted thallus that is often slightly granulose and usually sorediate. It forms sharply defined circular patches that may be surrounded by a pale prothallus. When present, the very dark grey-brown to black, flat to slightly convex apothecia have a slightly paler margin.
Thallus: C-, K-, UV+ bluish white
Fuscidea lightfootii is widespread across most of Scotland where it is found on smooth bark as an early coloniser of twigs. BLS distribution map
scottishlichens.co.uk 