The cambium that arises between the vascular bundles in the stem of a plant is known as the interfascicular cambium.

Cork cambium is the cambium tissue in the stem of a plant that gives rise to the cork on its outer surface. It is the lateral meristem and is responsible for secondary growth, replacing the epidermis in roots and stem.

Both, interfascicular cambium and cork cambium are formed due to cell dedifferentiation. Differentiation is the process which causes maturation of cells.

Dedifferentiation is the process in which a differentiated cell regains its ability to undergo cell division again under certain conditions.