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


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


TIFF (full resolution)

721×2400, 386.7 KiB

Large GIF

307×1024, 71.7 KiB

Medium GIF

192×640, 38.0 KiB

Small GIF

96×320, 15.1 KiB