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

Cortex tissue is technically a primary tissue and some biologists questions whether it is appropriate to use this term on a woody plant. Some biologists use this term to describe new tissue that forms to the inside of the phellogen. It has been used synonymously with phelloderm.