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Collenchymas is a type of permanent tissue which is found few layer below the epidermis of leaves and stem. The cells of this tissue are living, elongated and tightly packed with no inter-cellular space. The cells have small nucleus, large vacuoles and thin cell wall but irregularly thickened at the corners.

Collenchyma tissue provides flexibility to plants so that they can easily bend without breaking. It also provides mechanical support to plants.