In the dicot root, the vascular cambium is completely secondary in origin. It originates from the tissue located just below the phloem bundles, a portion of pericycle tissue, above the protoxylem forming a complete and continuous wavy ring, which later becomes circular.Further events are similar to those already described above for a dicotyledon stem. Secondary growth also occurs in stems and roots of gymnosperms. However, secondary growth does not occur in monocotyledons.
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