hypoderm

The cells of epiderm and hypoderm may be so similar that they appear to form a single tissue.

Some cells about the fibro-vascular bundle acquire thick walls with the appearance and chemical reaction of the hypoderm cells.

The stomata of Pine leaves are depressed below the surface and interrupt the continuity of epiderm and hypoderm.

The biform hypoderm is not always obvious (clausa, Banksiana, etc.) where in some leaves there is but one row of cells.

Epiderm and hypoderm of the leaf similar, appearing as a single tissue; resin-ducts external.