cork cambium (phellogen)
A type of cambium
arising within the outer layers of the stems of woody plants, usually as a complete ring surrounding the inner tissues. The cells of the cork cambium divide to produce an outer corky tissue (cork
) and an inner secondary cortex (phelloderm
). Cork, cork cambium, and phelloderm together make up the periderm
, an impermeable outer layer that protects the inner stem tissues if the outer tissues split as the stem girth increases with age. It thus takes over the functions of the epidermis.
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