File:Herbaceous Dicot Stem Vascular Bundles in Cucurbita (35207532680).jpg

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long section: Cucurbita stem magnification: 400x

<a href="http://blogs.berkshirecc.edu/bccoer" rel="nofollow">Berkshire Community College Bioscience Image Library</a>

Bicollateral vascular bundles have two zones of phloem and two zones of cambium on either side of the central xylem with outer facing tissues more heavily developed.

The sequence of tissues in the bicollateral vascular bundle is outer phloem, outer cambium, xylem, inner cambium and inner phloem with outer more heavily developed.

Walls of xylem vessels have lignin free pits and lignin thickenings that form rings, spirals, networks and solid blocks.

Between the xylem and phloem are a few regularly arranged layers of elongated cambium cells.
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Source Herbaceous Dicot Stem: Vascular Bundles in Cucurbita
Author Berkshire Community College Bioscience Image Library

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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/35207532680 (archive). It was reviewed on 5 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

5 October 2019

Files from Berkshire Community College Bioscience Image Library Flickr stream uploaded by Netha Hussain

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