Xylem Tissue


Xylem tissue is a complex tissue which always includes tracheary elements. Xylem serves to transport water up the plant. Tracheary elements have secondary walls with pits and are dead at maturity. If a tracheary element only has pits, it is considered a tracheid. If a tracheary element also has perforations, it is considered to be a vessel element. Conifers only have tracheids. flowering plants can have both.