ingrown bark

bark pocket, inbark, ingrown bark

A small quantity of bark, nearly or entirely enclosed in wood.
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References in periodicals archive ?
And these rarities are often described as 'Karelian' due to the sound ingrown bark, which creates a pleasing figure type that is much more common with the birch found in the special areas of Finland.
These species tend to have a rich and varied grain, with abundant knots, mineral streaks and even ingrown bark.
The burl character is unique in the fact that it is more like an ingrown bark than the true burl you see in maple, madrona, walnut, Carpathian elm and other burls.