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The transverse section (T.S.) of the coralloid root of *Cycas* shows distinct structural adaptations related to its symbiotic association with nitrogen-fixing cyanobacteria. The root is usually dichotomously branched and lacks root hairs. The outermost layer is the epidermis, which is thin and composed of small, closely packed cells. Beneath the epidermis lies the multilayered cortex, which is differentiated into two regions: the outer ____ ___ _________ _________ ______.
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