File:Woody Dicot Stem Periderm and Cortex in One Year Liriodendron (35914300153).jpg
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Summary
[edit]DescriptionWoody Dicot Stem Periderm and Cortex in One Year Liriodendron (35914300153).jpg |
cross section: Liriodendron stem magnification: 100x During the first year of growth the underling activity of the cork cambium begins to replace the cutinized epidermis 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. Deep to the periderm is a narrow cortex of parenchyma cells. The vascular cylinder consists of a narrow outer ring of primary phloem, a middle single layered ring of vascular cambium and a deeper large ring of primary xylem. Phloem wedges of sieve tubes and companion cells are layered and interspaced with masses of thick walled sclerenchyma cells, and conspicuous caps of sclerenchyma top each wedge of phloem. The cells of the deepest protoxylem are small, thin walled and separated from the pith by a starch sheath of dark staining parenchyma cells. Metaxylem cells above are larger, heavier walled . Xylem cells of the later wood are smaller and thicker walled. The vascular cylinder is extensively interrupted by radial bands of parenchymatous rays that serve in the lateral conduction of water and nutrients. Wide phloem rays taper to a few cells wide as they dip into the xylem. Narrow single celled rays also extend out from the pith. |
Date | |
Source | Woody Dicot Stem: Periderm and Cortex in One Year Liriodendron |
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@N03/35914300153 (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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Date and time of data generation | 11:00, 10 February 2014 |
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Horizontal resolution | 1 dpc |
Vertical resolution | 1 dpc |
Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 17:10, 21 August 2017 |
Y and C positioning | Centered |
Exif version | 2.3 |
Date and time of digitizing | 11:00, 10 February 2014 |
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DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |