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Contributions from the Botanical Laboratory of the University of Pennsylvania (Volume 55)

Contributions from the Botanical Laboratory of the University of Pennsylvania (Volume 55)


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1911 Excerpt: ... 1. Epidermis of polygonal cells highly cutinized on their outer face and giving rise to short and long, frequently bent, unicellular trichomes and short stalked glandular trichomes with balloon-shaped heads (M. Carolinensis and M. Macfarlanei) and both bowl-and balloon-shaped heads (M. cerifera). 2. Cortex of 6-8 layers of radially arranged polygonal cells, larger in the meso-and endo-than in the exocortex region. Many of these cells contain tannin, some starch grains, others rosette and monoclinic crystals, a few gummy lignin. 3. Endodermis not distinguishable from the other cells of the endocortex. 4. Pericambium showing a discontinuous ring of sclerenchyma elements. 5. Open collateral fibro-vascular bundles whose phloem region is very narrow and composed mostly of sieve tubes and phloem cells. The phloem cells are loaded with tannin. 6. A rectangular pith zone of polyhedral parenchyma cells whose walls are thickened. Many of these cells contain starch and a few gummy lignin. First pair of foliage leaves of M. cerifera The upper epidermis is composed of cells with slightly wavy vertical walls having a thicker cuticle than those of the lower epidermis and showing no stomata. In surface view these cells have a mean measurement of 33.99 M X 26.22. The cells of the lower epidermis have more prominently wavy vertical walls with a mean measurement of 36.42 ju X 24.28 p. The cells over the veins possess rectilinear walls and are somewhat elongated. Among the lower epidermal cells are to be noted many stomata which are slightly elevated and surrounded by 3-8 neighboring cells. The mesophyll shows dorso-ventral differentiation into palisade and spongy parenchyma regions. The palisade zone consists of two layers. The upper one of distinctly columnar shaped cells, t...


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Product Details
  • ISBN-13: 9781150062575
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 158
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1150062576
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 295 gr


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