Unknown white lichen with black, domed fruiting bodies

Unknown white lichen with black, domed fruiting bodies

Observation - Unknown white lichen with black, domed fruiting bodies. Description: On a rock that is surrounded by sea at high tide is this very small white lichen with black, domed fruiting bodies – perithecia? It looks rather as though someone has taken a lumpy spoonful of it and dropped it onto the rock! It is in the splash zone near

On a rock that is surrounded by sea at high tide is this very small white lichen with black, domed fruiting bodies – perithecia? It looks rather as though someone has taken a lumpy spoonful of it and dropped it onto the rock! It is in the splash zone near the top of the rock.

I have failed to find anything that looks or sounds quite like it. Can you help, please?