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Collenchyma cells bear a some resemblance to Parenchyma. They have a primary cell wall which contains lots of Pectins. Thus, they stain pink with Toluidine Blue. However, they have some distinguishing traits. They occur in groups just beneath the Epidermis. The cell wall is unevenly thickened. They are always elongated. |
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The thickenings can occur at the corners of adjacent cells. This is enhanced in this embossed image. | |
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Longitudinal
Section of Collenchyma which shows the Long Tapered shape of Collenchyma Cells. Note the difference in elongation compared to the adjacent Parenchyma Cells on the right. The ends of Collenchyma cells overlap. This makes them stronger. |
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