in shaken plants (to mimic the effects of wind etc.), may be 40-100% thicker than those not shaken.

There are four main types of collenchyma:
* Angular collenchyma (thickened at intercellular contact points)
* Tangential collenchyma (cells arranged into ordered rows and thickened at the tangential face of the cell wall)
* Annular collenchyma (uniformly thickened cell walls)
* Lacunar collenchyma (collenchyma with intercellular spaces)

Collenchyma cells are most often found adjacent to outer growing tissues

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