File:Woody Dicot Stem Proto and Metaxylem in One Year Liriodendron (36584602081).jpg

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cross section: Liriodendron stem magnification: 400x.

The vascular cylinder consists of a narrow outer ring of primary phloem, a middle single layered ring of vascular cambium and a deeper large ring of primary xylem. Phloem wedges of sieve tubes and companion cells are layered and interspaced with masses of thick walled sclerenchyma cells, and conspicuous caps of sclerenchyma top each wedge of phloem.

The cells of the deepest protoxylem are small, thin walled and separated from the pith by a starch sheath of dark staining parenchyma cells. Metaxylem cells above are larger, heavier walled .

The vascular cylinder is extensively interrupted by radial bands of parenchymatous rays that serve in the lateral conduction of water and nutrients. Wide phloem rays taper to a few cells wide as they dip into the xylem. Narrow single celled rays also extend out from the pith.
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Source Woody Dicot Stem: Proto and Metaxylem in One Year Liriodendron
Author Berkshire Community College Bioscience Image Library

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/36584602081 (archive). It was reviewed on 23 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

23 June 2018

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current00:03, 23 June 2018Thumbnail for version as of 00:03, 23 June 20183,264 × 1,840 (1.28 MB)Meisam (talk | contribs)Transferred from Flickr via #flickr2commons

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