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Bark

external parenchymal tissue, located just below the epidermis in the primary structure of the stem
the bark of a Monterey Pine

Bark is the covering of the stems of woody plants, like trees. Bark protects the tree. Bark of different plants and trees can look very different, it can be rough or smooth and can have different colors. It is the outer layer of tree trunks.

Most of the bark grows from the vascular cambium. Some outer parts of the bark sometimes come from a cork cambium.