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Text-Book of Botany, Morphological and Physiological

Text-Book of Botany, Morphological and Physiological


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 edition. Excerpt: ...expansion (Zamia). They are also distinguished from the stamens of most other flowering plants by their persistence, becoming lignified and often very hard. The numerous pollen-sacs on the under side of the stamens are usually collected into small groups numbering from two to five, like the sori of Ferns, these again forming larger groups on the right and left side of the leaf. The pollen-sacs are globular or ellipsoidal, usually about 1 mm. in size, and are attached with a narrow base to the under side of the stamen; Karsten states that in Zamia spiralis they are even stalked. They dehisce longitudinally, and are in all respects much more like the sporangia of Ferns than the pollen-sacs of other Phanerogams, from which they also differ in the firmness and hardness of their wall. The mode of development of the pollen-sacs and pollen-grains of Cycadeae was till lately unknown; it has only quite recently been observed by Juranyi in Ceratozamia longifolia. The pollensacs are formed on the under side of the stamens in the form of small papillas, probably consisting from the first of several cells over which the epidermis of the surface of the leaf is continuous. The inner tissue is next differentiated (as in the sporangia of Lycopodiacese, Equisetacea?, and Ophioglossacea?) into an outer layer of smaller cells enclosing a larger-celled tissue; since the cells of the latter continue to grow and divide in all directions, the mother-cells of the pollen are finally isolated, but densely crowded together, as in Dicotyledons. The mode of division of the mother-cells is nevertheless more like that of Monocotyledons in this respect, that they first of all split up successively into two daughter-cells, each of which again undergoes bipartition. The...


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Product Details
  • ISBN-13: 9781153424264
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 468
  • Spine Width: 24 mm
  • Width: 189 mm
  • ISBN-10: 1153424266
  • Publisher Date: 01 Apr 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 830 gr


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