in Tissues in Plants by

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  1. Sclerenchyma fibres: These are made up of elongated, narrow and spindle-shaped cells with thick walls having pointed ends walls. These fibres occur in longitudinal bundles with pointed ends of adjacent fibres interlocking to form strengthening tissue. The walls of the fibres may have bordered or unbordered pits.
  2. Sclereids: The cells are irregular in shape with walls that are thick, hard and lignified. Therefore, make the lumen very small. Elongated canal pits are found in the thickened cell walls and link adjacent cells.
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