Plant Cell Development 1

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First developmental stage of sieve tubes, companion cells, and phloem parenchyma. “A, a and b, two rows of procambial cells; in c and d, a has divided longitudinal and c is to become companion cells; d, a sieve tube, and b, phloem parenchyma.” -Stevens, 1916

Source

William Chase Stevens Plant Anatomy (Philadelphia, PA: P. Blakiston, 1916)

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