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In Pinus, the transverse section of the needle shows a well-adapted structure for xerophytic conditions. The epidermis is covered by a thick cuticle, followed by hypodermis composed of several layers of compact cells. The mesophyll is differentiated into palisade cells and spongy tissue, with resin canals scattered throughout the tissue. The vascular bundle is surrounded by endodermis and consists of xylem and phloem arranged in a collateral manner. The xylem is oriented toward the inner side while the phloem faces the outer side. A central resin duct is present, which helps in secretion and defense. Stomata are sunken and occur in multiple rows, aiding in water conservation. The coralloid root of Cycas exhibits a unique ______ ______ _________ ______ ______ _______ ___ ____ _______.
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