The bark on Pinus sylvestris is highly ornamental and is a useful identification feature. As the tree matures the dark gray bark at the base thickens but on the upper trunk and branches the bark becomes thin and flaky exposing a beautiful orange inner bark.
Karren Wcisel, TreeTopics.com
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Pinaceae, tree, conifer, cone, needle, evergreen, Pinus sylvestris, Scots pine, Scotch pine