Trail Black
When a tree branch is cut off, why does it seem to seep black stuff?
It seems that whenever I see a tree that has had parts cut off of it, the stub is black, or a trail of black comes from it down towards the ground. Almost as if it was burned.
A tree has a sap analogous to the blood which circulates in its phloem. Such sap is composed of oil,and other substances. When its branch is cut off then the injured part "bleeds" and undergoes oxygenation processes which turns the sap color darker. The gas in the sap evaporates and dries and hardened with some leaving resins on the "healing" injured part which leaves a dark scar as the layers or surface of the cut part had some dead tissues. It is its dead part which underwent several processes in its "trauma" experienced which you can see as burned looking.
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