File:Angiosperm Leaf Astroscleroids Throughout Mesophyll in Nymphaea (36909779143).jpg
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Summary
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| Description |
cross section: Nymphea leaf common name: Waterlily magnification: 100x Both the upper (adaxial) and lower (abaxial) epidermis are uniseriate and contain chloroplasts. The air exposed adaxial epidermis is well cutinized and contain numerous stomata that open into large substomatal air chambers. The submerged abaxial epidermis has a very thin cuticle and lacks stomata. Dark staining slime glands are present on the abaxial surface. Deep to the upper epidermis are several layers of tightly packed palisade mesophyll, the chief photosynthetic tissue of the leaf. Most of the leaf interior is occupied by a deeper zone of spongy mesophyll with large air spaces. Large red staining branched astroscleroids are abundant throughout the mesophyll. Vascular bundles are centrally located with collaterally arranged xylem toward the adaxial surface and phloem to the abaxial surface. Particularly noticeable is an outer bundle sheath of large parenchyma cells. All vascular tissues are highly reduced except in the mid rib area where bundles with defined phloem, proto and meta xylem, and a protoxylem lacunae can be seen. Tannin rich parenchyma cells are occasionally associated with phloem of larger bundles. The mid rib area is supported towards the abaxial surface by a wide wedge of supportive collenchyma. |
| Date | |
| Source | Angiosperm Leaf: Astroscleroids Throughout Mesophyll in Nymphaea |
| 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@N03/36909779143. 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 | 00:18, 23 June 2018 | | 3,264 × 1,840 (1.34 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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