Lecture 12

24 15c def fig 24 16 a vascular cambium secondary

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Unformatted text preview: ms: (Fig. 24-15c-d,e,f; Fig. 24-16) A. Vascular Cambium à༎ SECONDARY XYLEM AND SECONDARY PHLOEM - Vascular cambium develops by mitosis (periclinal divisions) of residual (undifferentiated) procambial cells that persist between primary phloem and primary xylem (Fig. 24-15c) - Pericycle opposite protoxylem poles begins to divide and forms the closed circle of vascular cambium around the xylem. - Once vascular cambium forms, repeated divisions of fusiform and ray initials give rise to cells of secondary xylem to the inside, secondary phloem to...
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This document was uploaded on 02/27/2014.

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