File:Gymnosperm Stem Resin Duct in Pinus Wood (36485874235).jpg
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| Description |
tangential section: Pinus stem magnification: 100x During the first year of growth the cutinized epidermis in Pinus is replaced by protective growth of cork rich periderm. The outer periderm consists of layers of cork cells, the phellem, which produces waterproofing suberin. Cork cells are dead at maturity. Deep to the phellem is a living layer of cork cambium or phellogen and beneath that, layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins. The cortex is divided into a thin outer hypodermis of lignified sclerenchyma cells and thicker inner cortex of thin walled parenchyma cells containing chloroplasts. A large longitudinally oriented resin duct is surrounded by secretory parenchyma that produces resins and turpentines. Seasonal activity of the cambium produces well-defined annual rings of green staining secondary phloem to the outside of the stem and purple staining xylem towards the inside of the stem. The uniform wood of Gymnosperms like Pinus consists almost entirely of longitudinally oriented bands of narrow, pale staining tracheids interrupted by short bands of horizontally oriented xylem rays. Xylem rays, usually one cell thick and a few cells high, are composed of clear, thin walled parenchyma cells. |
| Date | |
| Source | Gymnosperm Stem: Resin Duct in Pinus Wood |
| 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@N03/36485874235 (archive). It was reviewed on 22 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
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| current | 23:55, 22 June 2018 | | 3,264 × 1,840 (7 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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