DENDROLOGY

Detailed explanation-1: -Note: To explain in simple way, the layer of cells that are found between the Phloem and bark are called as vascular cambium, and this is formed by both intra and interfascicular cells, where they are meristematic, so they divide and form the secondary xylem and Phloem.

Detailed explanation-2: -cambium, called the phellogen or cork cambium, is the source of the periderm, a protective tissue that replaces the epidermis when the secondary growth displaces, and ultimately destroys, the epidermis of the primary plant body.

Detailed explanation-3: -The periderm thus consists of three different layers: phelloderm – inside of cork cambium; composed of living parenchyma cells. phellogen (cork cambium) – meristem that gives rise to periderm.