File:Woody Dicot Stem Primary Phloem and Cambium in One Year Quercus (35975035843).jpg
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Summary
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| Description |
cross section: One year Quercus stem magnification: 400x iron-alum hematoxylin and safranin stain Primary growth results in a ring of discrete vascular bundles that divides the parenchymatous cortex and pith. Xylem of each bundle is oriented towards the center of the stem and the phloem to the outside, with fascicular cambium in between. Phloem is heavily capped with sclerenchyma cells and sided by medullary parenchyma. Due to meristematic activity the vascular bundles expand to form a cylinder consisting of a narrow outer ring of primary phloem, a middle single layered ring of vascular cambium and a deeper large ring of primary xylem. The phloem becomes overlaid by heavy continuous ring of sclerenchyma. Bulging into the pith are small masses of the first xylem consisting of small protoxylem cells overlaid by a few larger, heavier walled cells of metaxylem. Above this and extending to the cambium are columns of primary xylem divided by narrow rays, extending from the large parenchymatous pith to the phloem. |
| Date | |
| Source | Woody Dicot Stem: Primary Phloem and Cambium in One Year Quercus |
| Author | Berkshire Community College Bioscience Image Library |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/35975035843 (archive). It was reviewed on 23 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
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| current | 00:06, 23 June 2018 | | 3,264 × 1,840 (5.64 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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