File:Woody Dicot Stem Periderm in One Year Sambucus (35922606845).jpg
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Summary
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| Description |
cross section: Sambucus stem magnification: 400x A one-year stem of Sambucus demonstrates the differentiation of the upper cortex in tissues of the periderm. During the first year of growth the epidermis is stretched laterally by the expansion of secondary xylem, phloem and cambium. The epidermis is replaced by a protective secondary zone of cork rich periderm. Continual growth of the periderm keeps up with that of underling tissues allowing it to replace the functions of the degrading epidermis. 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 green stained 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. |
| Date | |
| Source | Woody Dicot Stem: Periderm in One Year Sambucus |
| Author | Berkshire Community College Bioscience Image Library |
Licensing
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/35922606845 (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 | 00:04, 23 June 2018 | | 3,264 × 1,840 (1,016 KB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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