The epidermis (or periderm) originates from:

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(B) During secondary growth in dicot stems,the activity of the vascular cambium causes the rupture of the outer cortical and epidermal layers. To repl

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Cork cambium

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(B) During secondary growth in dicot stems,the activity of the vascular cambium causes the rupture of the outer cortical and epidermal layers. To replace these,a new meristematic tissue called the cork cambium (or phellogen) develops in the cortex region. The cork cambium cuts off cells on both sides; the inner cells differentiate into secondary cortex (phelloderm),and the outer cells differentiate into cork (phellem). Collectively,phellogen,phellem,and phelloderm are known as periderm. Therefore,the periderm originates from the cork cambium.

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