Lichen: Opegrapha atra | Nature Notes from Dorset

Pale, smooth barked trees often have pale grey or greenish patches with little black specs in the middle of them. This is not a bark blemish but a living lichen. 
Named Opegrapha atra it is the commonest of the family of six British species and possibly the easiest to identify becuase of these patches that enclose the central speeckled marks.
Silver and downy birch, as well as members of the willow family, are the favoured host trees for Opegrapha atra but it also, very occasionally, occurs on fence posts too.

Read more: Lichen: Opegrapha atra | Nature Notes from Dorset

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