Xanthoria parietina, an abundant golden lichen occurring on non acidic structures and walls, as well as bushes and trees. It is usually fertile, and in shaded conditions can be green, but in that case, the apothecia (fruits) will still be golden. Particularly common on structures where birds perch such as memorials in graveyards.
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This is brilliant stuff Simon
This is brilliant stuff Simon, just the sort of thing that people will benefit from!