|
The tissue is usually single layered
|
It is the multi-layered tissue formed by replacing the epidermis during the secondary growth of stems and roots
|
|
The cells are living and packed closely without intercellular spaces
|
The cells of peridermal tissues may be living (phelloderm) or dead (phellem)
|
|
The cells have cutinized outer walls
|
The cells of the phellem are suberinised and possess tannins
|
|
In aerial parts, the epidermis bears stomata for gaseous exchange
|
Phellem bears lenticels for exchange of gases
|
