Tree Biology

Contents: - periderm - phellem - cork cambium - phelloderm - cortex - phloem- phloem rays - phloem - sieve tube element - companion cells - cambial zone (cambium) - bark - xylem - growth ring - vessels - tyloses - parenchyma - axial parenchyma - multiserrate ray parenchyma - uniserrate ray parenchyma - fibers - symplast - apoplast - growth ring/ray compartment - decay development

Click on any of the above terms to view its location in the tree cross section

Vessels (in hardwoods) and tracheids (in conifers) conduct water and substances dissolved in water. Vessels are not living cells. Diffuse porous trees, such as the one illustrated above, generate large vessels early in the growing period and smaller-diameter vessels later.