Long, dignified dead cells found in the xylem of vascular plants are known as tracheids.
There is no nucleus in tracheids. The cell walls of tube cells, are usually ornamental or pits.
They do not mature into protoplasts and are primarily responsible for transporting inorganic salts and water from roots to needles, as well as providing structural strength to trees and supporting the crown weight in larger trees.
The Xylem parenchyma is a component of the "Xylem" complex tissue. The storage of carbohydrates, lipids, and water conduction is the primary function of xylem parenchyma cells.
The thick lignified fibers made up of dead sclerenchyma cells are known as xylem fibers. In a plant, they are found between the xylem vessels and the tracheid of the xylem. They are woody tissues with hard tissues.
One of the cell types present in the xylem, the water-conducting tissue of plants, is a vessel element or vessel member (also termed trachea or xylem vessel).
Thus, Tracheids are devoid of a nucleus and cytoplasm.