CORKCAMBIUM
Cork cambium
Cork cambium is a tissue found in many vascular plants as part of the periderm. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. It is found in woody and many herbaceous dicots, gymnosperms and some monocots, which usually lack secondary growth.The above text is a snippet from Wikipedia: Cork cambium
and as such is available under the Creative Commons Attribution/Share-Alike License.