Epidermal appendages are outgrowths that emerge from the epidermal layer.
These are of two types trichomes and emergences.
(i) Trichomes are unicellular or multicellular outgrowths of epidermis. These are of two kinds,
i. e., hair and scales. Hairs are elongated structures and can be unicellular or multicellular. Scales are multicellular flattened structures.
(ii) Emergences are multicellular epidermal outgrowths, which also contain some inner tissues,
e.g., Prickles. They are sharp and stiff outgrowths.