File:Perennial Monocot Stem Amphivasal Vascular Bundle in Acorus Rhizome (37645135916).jpg
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[edit]DescriptionPerennial Monocot Stem Amphivasal Vascular Bundle in Acorus Rhizome (37645135916).jpg |
cross section: Acorus calamus common name: Sweet Flag magnification: 100x <a href="http://blogs.berkshirecc.edu/bccoer" rel="nofollow">Berkshire Community College Bioscience Image Library</a> The rhizomes, or horizontal stems, of Acorus are notable for their accumulation of aromatic medicinal oils. The well cutinized epidermis is uniseriate showing radially elongated cells with thickened outer walls and occasional corky zones. The cortex consists of an outer hypodermis of 3-5 layers of densely packed collenchyma cells. Beneath the hypodermis lies a wide zone of starch containing parenchyma cells with numerous intracellular spaces. These spherical cells form a tight network with vascular bundles and small fiber bundles positioned at the junctions of the network. The boundary between the cortex and stele is marked by well-defined endodermis of one layer of thick walled barrel shaped starch contain cells. A casparian strip may be evident in some preparations. As in the cortex, the parenchymatous cells of the stele are arranged in tight aerenchymatous chains. The vascular bundles within the stele are wrapped in bundle sheaths and form a nearly continuous ring just beneath the endodermis. Unlike those situated in the cortex, these bundles are rarely associated with fibers. Both cortical and stelar vascular bundles are leptocentric, or amphivasal, meaning xylem and phloem are arranged in concentric rings with phloem to the inside and xylem to the outside of the bundle. Scattered throughout the cortex and stele are clear or yellowish cells containing aromatic oils, dark brown staining tannins and polygonal crystals of calcium oxalate. |
Date | |
Source | Perennial Monocot Stem: Amphivasal Vascular Bundle in Acorus Rhizome |
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@N03/37645135916 (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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current | 19:36, 5 October 2019 | 3,264 × 1,840 (2.22 MB) | Netha Hussain (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of data generation | 11:00, 10 February 2014 |
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Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 12:45, 14 October 2017 |
Date and time of digitizing | 11:00, 10 February 2014 |
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DateTimeDigitized subseconds | 00 |
Color space | sRGB |