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Cortex and Pith
This cross-section has a good view of a stem showing very clearly the cortex in relation to the epidermis and the vascular bundles and pith. The cortex is mainly thin-walled parenchyma cells with some chlorenchyma immediately subtending the epidermal tissue.
To read about primary growth in the vascular tissue system...
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Introduction | Flowers&Fruit | Roots | Stems | Leaves Section of Plant Biology Division of Biological Sciences UNIVERSITY OF CALIFORNIA, DAVIS |