What is the name of a tissue whose cells look like fibers with a thickened wall?

It is a mechanical fabric. It is typical for plant organisms. It is a cellular fiber that gives strength to the plant and can also perform other functions. For example, a conductive function. This tissue consists of both living and dead cells. This does not affect the function of the tissue. This tissue is formed constantly, but much depends on natural conditions, as well as on a sufficient amount of necessary substances, since the formation of new tissues requires substances that will form this tissue.