I can see you have a liverwort growing on it, but photo comes out very dark on my screen so can’t quite see if the round shapes are fruiting bodies of the liverwort or something else.
Judging by the positioning, I suspect those are either young woolly aphids (which are black until they cover themselves with white 'wax'), or eggs of the same, assuming they rub-off easily. The green crusty-looking stuff in the first photo is just lichen and is harmless.
A trowel in the hand is worth a thousand lost under a bush.
carolecrouch
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