Cortex is the region found between:

Cortex is the region present between epidermis and stele. The term cortex refers to the outermost layer of cells on a plant's stem or root. The cortex has the ability to transport nutrients into the core of the root. It uses diffusion to achieve transport. It also stores nutrients in the form of starch.

The cortex acts as a protective covering on plant and is often waterproof. Depending on the type of plant, the cortex can also store carbohydrates, tannins, essential oils, and resins.