File:Monocot Root Lilium (36045153985).jpg
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| Description |
cross section:Lilium root common name: lily magnification: 40x <a href="http://blogs.berkshirecc.edu/bccoer" rel="nofollow">Berkshire Community College Bioscience Image Library</a> The single layered epidermis lacks a cuticle. Root hairs appear as unicellular extensions of epidermal cells. The cortex is well-developed and divided into two zones; a narrow outer layer of closely packed smaller parenchyma cells and a wide inner layer of open larger aerenchyma cells The inmost area of the cortex is bounded by a prominent endodermis of cells whose walls are heavily suberized, marking the Casparian stip. The outer stele is bound is a pericycle of one layer thin walled parenchyma cells. The vascular tissues consist of radiating arms of xylem and phloem with phloem forming strands near the periphery of the vascular cylinder. The xylem is exarch: meaning the earlier smaller protoxylem is found towards the periphery and younger larger metaxylem to the center of the stem. Phloem tissues of sieve tubes, companion cells and phloem parenchyma are also exarch. The older protophloem is found towards the periphery and metaphloem towards the center of the stem. Phloem parenchyma may become sclerenchymized in older roots. Vascular cambium is absent, preventing secondary growth of the root. The central of the stele is occupied by pith containing thin walled starch containing parenchyma cells that may become sclerenchymized in older roots. |
| Date | |
| Source | Monocot Root: Lilium |
| 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@N03/36045153985 (archive). It was reviewed on 5 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
Files from Berkshire Community College Bioscience Image Library Flickr stream uploaded by Netha Hussain
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 19:40, 5 October 2019 | | 3,264 × 1,840 (4.68 MB) | Netha Hussain (talk | contribs) | Transferred from Flickr via #flickr2commons |
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