Cambium

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There are several distinct kinds of cambium found in plant stems and roots:

• Cork cambium, a tissue found in many vascular plants as part of the periderm.
• Unifacial cambium, which produces cells to the interior of its cylinder.
• Vascular cambium, a lateral meristem in the vascular tissue of plants.

References

1. ↑ http://botanydictionary.org/cambium.html