Dissection in an longitudinal plane, revealed closure of wound.
Note: Wound is still there. It did not heal. A tree does not heal a wound.
The brown column is color altered wood from a wound or an injury. Birches do not form heartwood (SHIGO and SHORTLE, 1979) . If the column of color altered wood is a result of the death of branches, we would call it false heartwood.
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