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Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends.Vessel is a long cylindrical tube-like structure made up of many cells called vessel members, each with lignified walls and a large central cavity.Xylem fibres have highly thickened walls and obliterated central lumens.Xylem parenchyma cells are living and thin-walled, and their cell walls are made up of cellulose.