secondary phloem Phloem produced by the vascular cambium in a woody plant stem or root.
secondary phloem
Tissue produced by vascular cambium and composed of both sieve tubes and companion cells.
secondary xylem
Tissue produced by vascular cambium and composed of both tracheids and vessel elements.
secondary phloem All phloem tissue formed by the vascular cambium in woody tissues.
secondary pollutants Chemicals modified to a hazardous form after entering the air or that are formed by chemical reactions as components of the air mix and interact.
The vascular cambium cells divide to produce secondary xylem to the inside and secondary phloem to the outside.
the growing meristematic tissue from which the secondary phloem and xylem tissues arise in roots and stems; located between wood and bark
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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Phloem is produced in phases. Primary phloem is laid down by the apical meristem. Secondary phloem is laid down by the vascular cambium to the inside of the established layer(s) of phloem.
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Secondary growth is produced by a cambium. It occurs in rows or ranks of cork, secondary xylem or secondary phloem cells. Cork cells (produced by a cork cambium) are technically part of the epidermis, and contribute to the bark of woody stems.
Cambium - In older parts of the root, another meristem forms between the xylem and phloem. Mitosis in the cambium produces new "secondary xylem" to the inside and secondary phloem to the outside.
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 See also: Xylem, Tissue, Phloem, Roots, Plant
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