File:Angiosperm Morphology Abaxial Midrib Collenchyma in Ligustrum (36198189414).jpg
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| Description |
cross section: Ligustrum leaf magnification:400x These dicotyledonous mesophytes show structural adaptations that extend their tolerance to drought and desiccation. The uniseriate upper and lower epidermis are heavily cutinized. Stomata are almost entirely limited to the lower or abaxial surface and are enclosed within small chambers partially roofed by ledges of cutin. Numerous mushroom shaped peltate trichomes are present in the lower, and occasionally upper, epidermis. These secretory trichomes have short stalks, appearing to sink into the epidermis. The upper palisade mesophyll is composed of two compact layers of elongated photosynthetic parenchyma. A well developed lower spongy mesophyll is composed of loosely arranged photosynthetic parenchyma with abundant air spaces. The abaxial stomata open into large irregularly shaped substomatal chambers. Midrib and blade vascular bundles are collateral with large thick-walled xylem vessels towards the adaxial surface and smaller sieve tubes and companion cells of phloem towards the abaxial leaf surface. Small masses of abaxial sclerenchyma and subepidermal collenchyma are particularly well developed below the midrib vein. A largely parenchymatous ring of bundle sheath cells is visible around all vascular bundles. |
| Date | |
| Source | Angiosperm Morphology: Abaxial Midrib Collenchyma in Ligustrum |
| 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. |
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This image was originally posted to Flickr by bccoer at https://flickr.com/photos/146824358@N03/36198189414 (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 | 00:13, 23 June 2018 | | 3,264 × 1,840 (782 KB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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