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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.


Fibers originate from the cambium as live cells but soon loose their living components. They develop thickened secondary walls of cellulose, hemicellulose and lignin. Cellulose is strong in tension. Lignin is strong in compression. Fibers can be found throughout the growth increment but on many trees more form later in the growing season.