metaphloem


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metaphloem

the typical PHLOEM that develops from the procambium next to the protophloem, towards the stem centre. It has normal SIEVE TUBES, in contrast with the small simplified sieve tubes of protophloem which lack companion cells.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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