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The Structure and Life-History of the Hay-Scented Fern Volume 94

The Structure and Life-History of the Hay-Scented Fern Volume 94


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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. 1908 edition. Excerpt: ...about twice as rapidly as in the ventral sections, and are larger (figs. 136, 139). A little later, divisions occur on the ventral side to about the number of those on the dorsal, but the curved position is maintained by greater elongation of the dorsal cells. Finally, when the leaf unfolds, the ventral cells elongate to equal those of the dorsal surface. The activity of the initial cell of the leaf is, as in most ferns, limited. After the rudiments of five to eight pairs of pinna; are visible and about three pairs of segments are cut off in advance of any visible differentiation into pinna;, the initial ceases to exist as such. Probably it simply begins to divide into sections as a segment would do. Fig. 138 shows a leaf-tip at this stage, where the initial has divided twice in succession on the same side. There is no evidence at all for a "transverse" division of the initial. After the initial is lost the leaf-apex is occupied by a group of marginal cells (figs. 137, 144) which grow and section and divide into halves for a long time. Since it is probable that each segment of the initial (while it lasts) develops a single pinna in the region of the lamina, we may say that the lowest eight to eleven pairs spring from as many segments. The remaining 22 to 40 pairs of pinna; come out after the single initial is lost. In either ease their actual history is the same. The apical growth of the leaf, with or without a single initial, gives rise directly to a slightly flattened and circinately curved rod of embryonic cells (figs. 140, 141, 144). Each margin is occupied by a row of marginal cells (fig. 137). Where a pinna is to develop, about six consecutive marginal cells elongate to form a papilla. By sectioning and halving they rapidly...


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Product Details
  • ISBN-13: 9781154860214
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1154860213
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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