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What is periderm? How does periderm formation take place in the dicot stems?

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Phellogen, phellem, and phelloderm are together known as periderm. Due to secondary growth of the stem, the outer cortical and epidermis layer broken and replaced by another meristematic issue called phellogen. Phellogen or cork cambium cuts o cells on both sides the outer cells are called cork or phellem and the inner cells are phelloderm or secondary cortex.

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