File:Woody Dicot Stem Late One Year Quercus (35975039843).jpg
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Summary
[edit]DescriptionWoody Dicot Stem Late One Year Quercus (35975039843).jpg |
cross section: One year Quercus stem magnification: 100x Quercus is noted for rapid cork formation. By the end of the first year the underlying activities of the cork cambium have replaced the epidermal and outer cortical tissues with a protective layer of cork rich periderm. The outermost layer of periderm consists of layers of cork cells, the phellem, which produce the waterproofing substance suberin. Cork cells are dead at maturity. Deep to the phellem is a layer of living cork cambium or phellogen and just beneath that layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins. In certain areas, the cork cambium over produces cork cells, resulting in the formation of ridges and deep cracks in the periderm. These deep fissures, or lenticels, permit gas exchange with tissues under the periderm. Deep to the periderm is a cortex of loosely packed parenchyma. Due to meristematic activity the vascular bundles have expanded 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 is 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: Late One Year Quercus |
Author | Berkshire Community College Bioscience Image Library |
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[edit]This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/35975039843 (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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current | 00:07, 23 June 2018 | 3,264 × 1,840 (1.88 MB) | Meisam (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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Orientation | Normal |
Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 09:20, 24 August 2017 |
Date and time of digitizing | 11:00, 10 February 2014 |
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DateTimeDigitized subseconds | 00 |
Color space | sRGB |