Food Tissues
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“Diagram to show the relation of the food-conducting tissues of the leaf to those of the stem; and in the stem the relation of these tissues of one year to those of preceding years. The dotted line between phloem and xylem stands for the cambium. The figures at the bottom of the diagram indicate the age in years of the zones of tissues in phloem and xylem.” -Stevens, 1916
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Cellular BotanySource
William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)
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