It eventually becomes the fasciscular cambial portion of the vascular cambium . In pines , it is the little globs of material in the resin ducts that give pine stems their characteristic pine odor. Rhizome A rhizome is a modified stem that has nodes and internodes that grows at ground level or just below ground level. It is thickened because of food storage. Stems or leaves branch off the rhizome at the nodes.
Roots form by adventitious buds along the lower surface.
Thus, it acts like a perennial rootstock. A good example is an iris or fern rhizome. They greatly expand the surface area of the root so that minerals and water are more easily absorbed. The root-hair zone is the zone in the differentiating root tip where the final maturation and full differentiation of all the cells occurs. The prominent part of this zone is the root hairs themselves.