The epidermal tissue system comprises of one cell thick layer of epidermal tissue and forms the outer most covering of the whole plant body.
Modification of Epidermal Cells Following are the modifications of the epidermal tissue
(i) root hair
Structure
These unicellular hairs are the extensions of epidermal cell of roots in the root hair zone.


Function
They increase the surface area for absorption of water and minerals.
(ii) Epidermal Appendages
Structure
These are called trichomes and are epidermal cell modifications. There any be unicellular or multicellular.
Appendages of epidermis of leaves
A-Stellate hair of a Alyssum
B-Glandular hair of Pelargonium
C-Short glandular hair of Lavandula
D-Floccose hair of Malva
E-Glandular hair of solanum
F-Urtivating hair of Verbascum
Function
They produce some glandular secretions.