what is phellem and phellogen in simple language

Phellogen is the meristematic cell layer present in the vascular plants which result in the formation of periderm. Phellogen is also known as cork cambium.

Phellem is the cells that originate from the phellogen at the time of its division, forming the external part of the periderm. Phellem is also known as cork.

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 phellem is the cork while phellogen is its cambium i.e. cork cambium

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