Xylem Development 3

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Stages in the development of the elements of the xylem. “C, steps in the development of wood fibers from cambial cells; 1, cambial cells; 2, the same grown larger in all dimensions with cells shoving past each other as they elongate; 3, a later stage with cells longer and more pointed and walls becoming thickened and pitted; 4, complete wood fibers with walls more thickened than in the previous stage and lignified, as shown by the stippling. The protoplasts in this last stage have disappeared and the fibers are dead.” -Stevens, 1916


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


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