File:Herbaceous Dicot Stem Cucurbita (35207517850).jpg
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Summary
[edit]DescriptionHerbaceous Dicot Stem Cucurbita (35207517850).jpg |
long section: Cucurbita stem magnification: 100x The epidermis is usually single layered with an outer cuticle and multicellular trichomes. The cortex consists of a conspicuous hypodermis of parenchyma cells with collections of collenchyma cells at the stem ridges. The deepest layer of the cortex is marked by a starch sheath (large barrel-shaped cells contain starch granules). Bicollateral vascular bundles have two zones of phloem and two zones of cambium on either side of the central xylem with outer facing tissues more heavily developed.
The sequence of tissues in the bicollateral vascular bundle is outer phloem, outer cambium, xylem, inner cambium and inner phloem with outer more heavily developed. Walls of xylem vessels have lignin free pits and lignin thickenings that form rings, spirals, networks and solid blocks. Phloem consists of large clear sieve tubes with pitted cell walls and sieve plates and small narrow green stained companion cells. Many sieve plates have deposits of a mucoid p-protein that forms as part of the trauma response in injured phloem. Between the xylem and phloem are a few regularly arranged layers of elongated cambium cells. |
Date | |
Source | Herbaceous Dicot Stem: Cucurbita |
Author | Berkshire Community College Bioscience Image Library |
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/35207517850 (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 | 19:44, 5 October 2019 | ![]() | 3,264 × 1,840 (1.6 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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Orientation | Normal |
Software used | Windows Photo Editor 10.0.10011.16384 |
File change date and time | 13:07, 28 June 2017 |
Date and time of digitizing | 11:00, 10 February 2014 |
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DateTimeDigitized subseconds | 00 |
Color space | sRGB |