Lignin by providing strength, allows sclerenchyma cells to provide support and play a role analogous to that of an animal's skeleton.
In plants, sclerenchyma supports tissue made up of a variety of hard, woody cell types. Sclerenchyma cells that have reached maturity are often dead cells with significantly enlarged secondary walls that contain lignin. The cells, which are rigid and non-stretchable, are typically found in parts of plant bodies that are not actively growing, such as the bark or mature stems. One of the three types of ground, or fundamental, tissue in plants is sclerenchyma; the other two types are collenchyma and parenchyma, or living thin-walled tissue.
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