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Leland Stanford Junior University Publications; University Series Volume 11

Leland Stanford Junior University Publications; University Series Volume 11


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About the Book

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. 1913 edition. Excerpt: ...1906. Reduced to natural size in the figures. Near the lower edge of the figure is a large archegonial prothallus. irregular in outline but plainly dorsi-ventral in structure. This has rhizoids only on the side toward the middle of the tile. Comparing this prothallus with the two nearest the center of the culture, one sees that the more uniform illumination of the plants in the middle is accompanied by a more uniform growth of rhizoids. The distance between the prothallus at the edge and those in the middle of the tile is about 2 centimeters, but this slight difference in position is accompanied by enough difference in illumination to permit the plantlet near the edge to complete its usual dorsi-ventral development, while the plants at the center form rhizoids and reproductive organs equally on both sides. From this one may infer either that the fern prothallus is very sensitive to light, since slight differences in illumination cause such evident differences in behavior, or that it is only slightly sensitive, since exactly uniform illumination is necessary to overcome the usual dorsi-ventrality in any degree. Whether the plant is sensitive or not sensitive can be proved only by experiment. One of these experiments would involve constant illumination, and this I hope to try shortly. In Figure 2 the number is larger, the distribution more regular, and the results striking. Figure 3 is that of a shelf culture, the direction of illumination of which is indicated by the arrow. The size, position, form and appendages of the largest archegonial prothalli are quite as usual and normal. Rhizoids and archegonia develop only on the side away from the light, the prothalli are erect in response to the nearly horizontal plane along which the light is...


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Product Details
  • ISBN-13: 9781234200176
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1234200171
  • Publisher Date: 05 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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