Periderm

periderm
(pair-eh-durm)
The protective coat that replaces the epidermis in plants during secondary growth, formed of the cork and cork cambium.
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periderm Protective tissue that replaces the epidermis after secondary growth begins; it includes the cork, the cork cambium, and sometimes other cells.

periderm. Several layers of corky cells located on the outside of the epidermis of a potato tuber and containing high amounts of suberin.

Epidermis and periderm are the dermal tissues in vascular plants. The epidermis forms the boundary between the plant and the external world.

lenticel Isolated areas of loosely arranged cells in the cork surfaces of stems, roots, and fruit that allow interchange of gases between internal tissues and the atmosphere through the periderm.
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Some epidermal cells are modified to form guard cells or hairs of various types. In woody plants the functions of the shoot epidermis are taken over by the periderm tissues and in mature roots the epidermis is sloughed off and replaced by the ...