Do you know much about lichen?

Photographed this during a woodland walk today and realised I don’t know very much about what sort of lichen it is...tried to look it up and found that maybe it’s called ‘old man’s beard’ lichen?

It reminded me of a fun, family holiday in Brittany a few years ago, where we came upon a fabulous little flower shop in Carnac, Brittany, which specialised in air plants.