Pit Development

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“Different stages in the development of a bordered pit. b, The original, thin, primary wall; a, the overhanging border formed as the wall thickened. B, Thickening of the wall has continued and extended the border; the primary wall has thickened at c, forming the torus. C, the border and the torus are finished.” -Stevens, 1916


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


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