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cambium
A layer of actively dividing, meristematic tissue, two to four cells thick, lying between the xylem and phloem in plants. In woody plants, a complete ring of cambium develops which produces new xylem cells on the inside and phloem on the outside by a the process known as secondary thickening. In some trees, under the epidermis, a layer of cork cambium develops which then produces a corky bark.
Related category
• BOTANY
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