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Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 3

Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 3


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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. 1907 Excerpt: ...the intermediate layer, or the epidermis, or both, are rich brown in color. These almost invariably have no other color in any part, and the seeds are consequently of various shades of clear brown. This condition is shown by P. acuminatus, glaber, cordifolius, secundiflorus, and many others. All three layers of the testa have a tendency to develop brown color. The paper quoted also takes in the development of the seed coat in two species, and states that the brown color of the tissues, as well as the violet pigment in the inner layer, appears only after the seed is fully formed, that is, upon ripening. The walls of the inner layer are least affected by browning, in many cases they remain perfectly clear, and in others becoming merely of a light yellowish or brownish tint. It is in the intermediate layer and the epidermis that most of the brown color resides. The intermediate layer by virtue of its density carries the greater amount of color and is therefore the more important color tissue in the brown colored seeds. Bachmann finds among the seeds studied by him, fine network thickening in the outer cells of the intermediate layer in P. Digitalis. The cells still re tain some form.although the thickenings were unable to prevent considerable compression. I have not detected net thickening of the intermediate layer cells in other seeds but those mentioned, except at the micropylar end. Here in many seeds there is a marked proliferation of the cells of the middle layer into a kind of cap. The cells in this cap are heavily net thickened, only slightly compressed, and retain their parenchymatous appearance with intercellular spaces. The epidermal cells are pentagonal or hexagonal in outline on surface view, the angles in some being very sharp, in others more roun...


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Product Details
  • ISBN-13: 9781150824524
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 104
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1150824522
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 200 gr


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