$A-$ cortex, $B-$ endodermins.

In dicotyledous root, the cortex consists of several layer thin walled parenchyma cells. These parenchyma cells have intercellular space. The inner most layer of the cortex is called endodermis. It surrounds the vascular tissue.

The innermost layer of cortex is called endodermis. It comprises a single layer of barrel-shaped cells without any intercellular spaces. The tangential as well as radial walls of the endodermal cells have a deposition of water impermeable, waxy material called suberin in the form of casparian strips