This is a portion of a tree that has been partially sawed off. This portion of the tree contains an example of cambium. Cambium is a collage of meristem cells that surround the stem of a plant and through this tissue phloem, xylem, or cork generate by dividing. This division can account for additional thickening in woody plants/ trees. The cambium on this portion of the tree is distinctly shown as the brown outline or border between the secondary thickening and the major wood.
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