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secondarygrowth213-page2 - interior of the stem and...

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Secondary Growth in Stems: Wood, Bark and Surface Features - 2 Cambium initials Anticlinal (C ± C) and Periclinal (C ± X or P) divisions In the transition from primary to secondary growth in those stems that have discrete vascular bundles, the early vascular cambium produces meristematic cells both within the vascular bundle, called vascular bundle cambium (fascicular cambium), and in the pith rays between adjacent vascular bundles (inter-fascicular cambium) to produce a complete ring of vascular cambium. Interfasciular Cambium Present Secondary Xylem and Phloem visible Transition to Secondary Growth Once a vascular cylinder is formed, cambium produces secondary xylem toward the
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Unformatted text preview: interior of the stem and secondary phloem toward the exterior of the stem (the periclinal divisions). Additional cambium cells are found between the xylem and phloem, and also divide "sideways" (the anticlinal divisions) to maintain a continual cambium cylinder as the diameter of the stem increases. Most cells produced are xylem. Cambium exhibits seasonal dormancy in areas that have distinct seasons, such as the temperate biomes. This contributes to the growth rings common in wood. In many tropical species cambium is always active, and wood lacks distinctive rings....
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