Lichen: Lecanora chlarotera | Nature Notes from Dorset

A smoothish, 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 crustose lichen and is widespread and common on smooth, nutrient-rich tree bark, both trunks and branches and it is a characteristic early coloniser of young, planted, semi-urban trees, as in supermarket car-parks. [ http://www.lichens.lastdragon.org/Lecanora_chlarotera.html]. It can also be frequently found on fences and timber. 

Read more: Lichen: Lecanora chlarotera | Nature Notes from Dorset

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