Lichen on rock near seashore

Lichen on rock near seashore

Observation - Lichen on rock near seashore - UK and Ireland. Description: Background lichen is off-white poss Pertusaria sp.? In the centre is a grey lichen with a strong dark-grey border, which appears to be over-growing the Pertusaria.

Background lichen is off-white poss Pertusaria sp.? In the centre is a grey lichen with a strong dark-grey border, which appears to be over-growing the Pertusaria.