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File:Herbaceous Dicot Root Closed Vascular Bundle in Mature Ranunculus (35613584780).jpg

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cross section: Mature Ranunculus root common name: Buttercup magnification: 400x

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

The cortex is well-developed and divided into two zones; a narrow outer layer of closely packed smaller parenchyma cells (exodermis) and a wide inner layer of larger open aerenchyma cells

The inmost area of the cortex is bounded by an endodermis or starch sheath with larger barrel shaped cells and thickened walls that mark the red staining casparian strip. Within the endodermis occasional small passage cells serve to transport of water into the stele or vascular bundle.

The stele is bound on its outmost edge by is a pericycle of single layered thin walled parenchyma cells.

The closed vascular bundles are arranged radially with arms of exarch xylem interspaced with patches of phloem and parenchymous conjunctive tissue. These tissues may become sclerenchymous in older roots

Vascular cambium is also absent, preventing secondary growth of the root.
Date
Source Herbaceous Dicot Root: Closed Vascular Bundle in Mature Ranunculus
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@N03/35613584780 (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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current19:41, 5 October 2019Thumbnail for version as of 19:41, 5 October 20193,264 × 1,840 (1.25 MB)Netha HussainTransferred from Flickr via #flickr2commons

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