File:Gymnosperm Stem Phloem in Four Year Pinus (35498048414).jpg
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| Description |
cross section: Pinus stem magnification: 100x The cortex is divided into a thin outer hypodermis of lignified sclerenchyma cells and thicker inner cortex of thin walled parenchyma cells containing chloroplasts. Large resin ducts are surrounded by secretory parenchyma that produces resins and turpentines. Some cells enlarge into dark staining tyloses. Both endoderm and pericycle are inconspicuous. Phloem is endarch but annual growth the of stem makes it difficult to distinguish between older protophloem to the periphery and younger metapholem towards center of the stem. Phloem lacks companion cells, consisting entirely of sieve tubes and phloem parenchyma. Medullary rays in the secondary phloem include protein rich albuminous cells. Visit the BCC Bioscience Image featuring the Microscopic World of Plants. <a href="http://www.berkshirecc.edu/biologyimages" rel="nofollow">www.berkshirecc.edu/biologyimages</a> |
| Date | |
| Source | Gymnosperm Stem: Phloem in Four Year Pinus |
| 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. |
| 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@N03/35498048414 (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 | 23:54, 22 June 2018 | | 3,264 × 1,840 (7.86 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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