When mature, sclerenchyma tissue is made up of dead cells with thicker walls containing lignin and a high cellulose content (60-80 percent), and it provides structural support to plants.
Coconut husks are made up of sclerenchymatous tissue.
Thick-walled, generally lignified cells protect nuts and fruits from the environment.
It's also known as the plant's supporting tissues since it gives the plant mechanical strength and rigidity.