Lateral meristem
Appearance
Lateral meristems give rise to the secondary plant body. The stems and roots of some plants form wood and become thick; it is the lateral meristems that give rise to the tissues responsible for this thickening.
Vascular Cambium=xylem(rings) and phloem(bark; Cork Cambium= Tough covering replacing the epidermis
Both vascular cambium and cork cambium are responsible for lateral growth in a plant. This is called secondary growth as opposed to primary growth in apical meristems.