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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Well, flat, yellow, on rock and, facing North.
Is it folicose? Help me identify it precisely please.
It's hard to tell from the photographs, but this looks like crustose to me. Other than this, it is difficult to identify further.
Thank you for your tip. I looked up the licen website and thought it might be caloplaca marina, just because it is next to the coast, but I think your identification of 'flavescens' is more likely.
Yes, C. flavescens is an inland species that is also common on coastal rocks, as are a number of other Caloplaca species. The placodioid margin rules out C. marina, but separating C. flavescens from the strictly coastal C. thallincola can be a headache at times.
Lat/Lng: 51.3927, 1.387
OS grid ref: TR357714
North facing rock lining sea wall defences. Horizontal cliff face walling promenade at Fulsam Rock