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Tree biology

Contents: - periderm - phellem - cork cambium - phelloderm - cortex - phloem- phloem rays - 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 - wounding response - decay development

Select any of the above terms to view its location in the tree cross section. Text at bottom.

Periderm is a term used to describe the phellem, phellogen and phelloderm collectively. It is the outer bark of the tree. The phellogen generates the periderm.

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