- the part of a vascular bundle consisting of sieve tubes, companion cells, parenchyma, and fibers and forming the food-conducting tissue of a plant.
Origin of phloem
< German (1858), irregular < Greek phló(os) bark (variant of phloiós) + -ēma deverbal noun ending
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for phloem
In some cases he seems to refer to the phloem and cambium by this name, and in other cases to the perimedullary zone.
The browning in the vascular bundles appeared to be confined to the phloem tissue.
The central tissue (x) is called the woody tissue (xylem); the outer, the bast (phloem).
This shows a number of white bars (xylem) surrounded by a more delicate tissue (phloem).
The phloem, when strongly magnified, is seen to be made up of cells arranged in nearly regular radiating rows.
- tissue in higher plants that conducts synthesized food substances to all parts of the plant
C19: via German from Greek phloos bark
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for phloem
1870, from German phloëm (1858), coined by German botanist Karl Wilhelm von Nägeli (1817-1891) from Greek phloos, phloios "bark of trees," of uncertain origin, + passive suffix -ema.
Online Etymology Dictionary, © 2010 Douglas Harper
- A tissue in vascular plants that conducts food from the leaves and other photosynthetic tissues to other plant parts. Phloem consists of several different kinds of cells: sieve elements, parenchyma cells, sclereids, and fibers. In mature woody plants it forms a sheathlike layer of tissue in the stem, just inside the bark. See more at cambium photosynthesis. Compare xylem.
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