What is the phellogen? What its function?
The Phellogen also called as cork cambium is the meristematic plant tissue responsible for the formation of the periderm (the covering of the stem, shoots and roots). In the inner side of the phellogen layer forms the phelloderm and its outer side forms the cork (suber) and the suber secretes suberin, an impermeable substance that impregnates the tissue.