Lichen (Lecanora chlarotera)

A smooothish, grey background (the thallus) with reddish brown discs (the apothecia) growing on tree bark indicates that this is almost certainly Lecanora chlarotera.
This is a very common lichen across the country with the exception of the south east and the industrial midalnds as it is not able to tollerate polluted environments.
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Find out more about the nature of Dorset at my website www.natureofdorset.co.uk

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