File:Gymnosperm Leaves Resin Ducts in Two Needle Pinus (36501124165).jpg
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| Description |
cross section: Pinus needle magnification: 400x Pinus needles may be circular, semicircular or triangular in cross section and are structurally adapted to tolerate xeric stress and freezing. A single layered epidermis of lignified cells is covered by a heavy waxy cuticle. Numerous sunken stomata are scattered over the entire epidermal surface. They are bounded by pairs of subsidiary cells, and open internally to a substomatal cavity and externally to a respiratory cavity or vestibule. The underlying hypodermis consists of several layers of thick-walled sclerenchyma, particularly well-developed at ridges. Deep to the hypodermis lies an undifferentiated photosynthetic mesophyll. Cells are distinctively lobed with infolded cell walls. They are filled with chloroplasts and starch grains that may be difficult to see because of an accumulation of dark staining tannins and resins. A few resin canals can be seen close to the hypodermal side of the mesophyll. Visit the BCC Bioscience Image featuring the Microscopic World of Plants. <a href="http://www.berkshirecc.edu/biologyimages" rel="nofollow">www.berkshirecc.edu/biologyimages</a> |
| Date | |
| Source | Gymnosperm Leaves: Resin Ducts in Two Needle Pinus |
| 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@N03/36501124165 (archive). It was reviewed on 22 June 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
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| current | 23:56, 22 June 2018 | | 3,264 × 1,840 (4.83 MB) | Meisam (talk | contribs) | Transferred from Flickr via #flickr2commons |
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