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Outlines of Classification and Special Morphology of Plants

Outlines of Classification and Special Morphology of Plants


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About the Book

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. 1887 Excerpt: ... These thin strips at length disappear, and the thicker parts separate from one another, if the environment is dry, as two spiral bands. These two bands form a four-armed cross when unrolled, and are narrower in the centre where they are attached to the second coat; it is this point of attachment probably which is seen in the unripe spore as an umbilical thickening (;/, A, B). An outer very thin cuticularised layer may be distinguished on the developed elaters, which are more than usually hygroscopic, rolling themselves round the spore when the air is damp and unrolling again as the air becomes drier; if alternation of these conditions is rapidly brought about, as by breathing lightly on the spores under the microscope, the latter are set in lively motion by the movements of the elaters. The office of the elaters is to cause a number of spores to remain attached to one another at the period of dispersion, so that they leave the sporangium in small groups1; if they become wetted, as they may on slightly moistened ground, the union between them becomes still closer, since the elaters which are only partially rolled up hold them all the tighter together. As the prothallia are generally unisexual, it is evidently advantageous to the plant that the elaters should cause several spores to germinate in the immediate neighbourhood of one another. If spores, in which the outer coat is not yet split up to form the elaters but shows the preliminary differentiation, are allowed to lie for some time in glycerine, each spore surrounded by its third (inner) coat shrinks considerably, and the second cuticularised coat separates from the inner in folds. The third (inner) coat is differentiated into an outer granular cuticularised exosporium, and an inner layer of cellulose, ...


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Product Details
  • ISBN-13: 9781153392785
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 276
  • Spine Width: 15 mm
  • Width: 189 mm
  • ISBN-10: 115339278X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 499 gr


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