File:Herbaceous Dicot Stem Inner Phloem and Cambium in Cucurbita Groove Bundle (37322634511).jpg
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| Description |
Cross section: Cucurbita Common name: Pumpkin/Squash Magnification: 100x Like most herbaceous dicots, Cucurbita is capable of limited amounts of secondary growth. The stem is characterized by distinct ridges and furrows with vascular bundles in two rings: five smaller leaf trace bundles at the ridges and five larger bundles at the furrows. The vascular bundles are bicollateral; the central xylem is bound by an inner and outer cambium, and topped by a larger outer and a smaller inner phloem. Sieve tubes, companion cells and phloem parenchyma are clearly evident the phloem. Xylem is well developed with numerous protoxylem evident towards the inside, and very large metaxylem to the outside of the bundles. Xylem consist primarily of large vessels and xylem parenchyma; tracheids and fibers are rare. Secondary vascular tissues are present but often difficult to distinguish from the primary. The vascular bundles are separated by zones of internal parenchyma. The central pith is not present, having disintegrated early in the development of the stem. |
| Date | |
| Source | Herbaceous Dicot Stem: Inner Phloem and Cambium in Cucurbita Groove Bundle |
| 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@N03/37322634511 (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 | 00:05, 23 June 2018 | | 3,264 × 1,840 (1.97 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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