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Text File  |  1992-09-01  |  536b  |  14 lines
  1. A strand of primary conducting tissue (a
  2. `vein') in vascular plants, consisting mainly
  3. of water-conducting tissues, metaxylem and
  4. protoxylem, which together make up the
  5. primary xylem, and nutrient-conducting
  6. tissue, phloem. It extends from the roots to
  7. the stems and leaves. Typically the phloem is
  8. situated nearest to the epidermis and the
  9. xylem towards the centre of the bundle. In
  10. plants exhibiting secondary growth, the xylem
  11. and phloem are separated by a thin layer of
  12. vascular cambium, which gives rise to new
  13. conducting tissues.
  14.