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Cortex - The cortex is a layer inside the thin outer bark on young stems. It mostly contains parenchyma cells that have chlorophyll. Cortex with chlorophyll is an energy trapping tissue. Also found in bark fissures of some mature trees. Cortex is a tissue in the bark of young trees and in some old trees that contains chlorophyll, the substance that can trap the energy of the sun in a process called photosynthesis. Chlorophyll is usually abundant in the cortex, pith, or other living tissues in young twigs. Woody roots have a non-green cortex!

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