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PLANT TISSUES AND CELLS

Collenchyma

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Organization of The Plant
Plant Tissue Systems
Simple Tissues
Parenchyma
Collenchyma
Sclerenchyma
Glossary
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Collencyma Cell

Collenchyma cell have thicker primary walls than parenchyma cell, though the walls are unevenly thickened. Young stems and petioles often have strands of collenchyma cells just below their epidermis. Collenchyma cells lack secondary walls, and the hardening agent lignin is absent in their primary walls. Therefore, they provide flexible support without restraining growth. At functional maturity, collenchyma cells are living and flexible, elongating with the stems and leaves they support. Grouped in strands or cylinders, collenchyma cells help support young parts of the plant shoot. Different types in collenchyma cells are classified according to the arrangement of the wall thickenings.

Angular Collenchyma

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Angular collenchyma

Angular collencyma is the most common type of collenchyma cell. The cell corners are differentially thickened or the deposition may be restricted to the corner. This type of collenchyma cells can be seen in herbaceous stems and petiole.

Lacunar Collenchyma

Lacunar collenchyma consist thickening around the cell walls facing the cavity lumen or intracellular spaces.

Lamellar Collenchyma

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Lamellar Collenchyma

Lamellar collenchyma is very much alike to angular collenchyma but the cells are regularly arranged. Thickening occurs at the inner and outer tangential walls.

Additional Information :

Collenchyma

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