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Sclerenchyma elongated cells with pointed ends and much thickened cell-wall.
Sclerenchyma forms an uninterrupted covering in the early stages of the seed; but as the seed develops, surrounding tissues grow more rapidly than the sclerenchyma, and the cells are pushed apart and scattered.
Sclerenchyma cells have thick secondary cell walls. a. They are impregnated with lignin that makes the walls tough and hard. b.
Sclerenchyma cells form fibers (used in linen and rope) and shorter sclereids (found in seed coats, nut shells, and gritty pears).
Sclerenchyma; 2. vascular bundle; 3. epidermis; 4. stomata.]
Sclerenchyma; 2. stomata; 3. chlorophyllous layer.] [Illustration: Fig. 54.