File:Woody Dicot Stem Ray System in Four Year Liriodendron (36553835952).jpg

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cross section: Sambucus stem magnification: 100x

The vascular cylinder consists of a wide outer ring of primary and secondary phloem, a middle ring of vascular cambium and a deeper larger rings of primary and secondary xylem. Phloem bands of sieve tubes and companion cells are layered and interspaced with parenchyma cells masses and occasional small bundles of sclerenchyma cells. Small masses of calcium oxalate crystals are present. Xylem is separated from the pith by a starch sheath of dark staining parenchyma cells.

The vascular cylinder is divided into narrow columns by radial bands of parenchymatous rays that extend from pith to phloem. Wide phloem rays taper as they dip into the xylem where they merge with the starch sheath. A large parenchymatous pith occupies the center of the stem.
Date
Source Woody Dicot Stem: Ray System in Four 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@N03/36553835952 (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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current00:04, 23 June 2018Thumbnail for version as of 00:04, 23 June 20183,264 × 1,840 (2.04 MB)Meisam (talk | contribs)Transferred from Flickr via #flickr2commons

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