File:Angiosperm Leaf Midrib Vascular Bundle in The Hydrophyte Potamogeton (36716448871).jpg

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cross section: Potamogeton leaf magnification: 400x

Both the upper (adaxial) and lower (abaxial) epidermis are uniseriate, lightly cutinized and contain chloroplasts. The air exposed and adaxial epidermis contains numerous stomata that open into large substomatal air spaces. The submerged and abaxial epidermis lacks stomata.

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 regularly arranged air spaces that extend throughout the leaf and into the stem. Spongy mesophyll gives the floating leaf buoyancy while providing abundant space for the storage of photosynthesis gases. Air chamber walls, termed diaphragms, consist of one or two layers of photosynthetic parenchyma with small perforations that allow easy movement of gases while blocking the movement of water.

Vascular bundles are centrally located with xylem toward the adaxial surface and phloem to the abaxial surface. All vascular tissues are reduced with xylem lacking in all but the largest bundles. In smaller bundles xylem is replaced by air chambers or xylem lacuna. Phloem is better developed.

All vascular tissues, including xylem, are better developed in the mid vein. Particularly noticeable is an outer bundle sheath of large parenchyma and deeper wrapping of heavy walled supportive sclerenchyma.
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Source Angiosperm Leaf: Midrib Vascular Bundle in The Hydrophyte Potamogeton
Author Berkshire Community College Bioscience Image Library

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Creative Commons CC-Zero 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.

This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/36716448871. It was reviewed on 23 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

23 June 2018

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current00:10, 23 June 2018Thumbnail for version as of 00:10, 23 June 20183,264 × 1,840 (4.16 MB)Meisam (talk | contribs)Transferred from Flickr via #flickr2commons

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