xylem have cell walls made of lignin

xylem has perforated cross walls

phloem has permeable cell walls

xylem tissue has companion cells

phloem cells contain cytoplasm

phloem occupy the center of the vascular bundle

substances in the xylem only move in one direction

both xylem and phloem have parenchyma

xylem and phloem contain tracheids

phloem cells develop a nucleus when they are mature

phloem tissue contains sclereids cells with extremely thick cell walls.

both xylem and phloem sieve tubes are made up of many cells joined end to end to form a long, hollow tube structure