Annals of Botany (Volume 20)
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Annals of Botany (Volume 20)

Annals of Botany (Volume 20)


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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. 1906. Excerpt: ... the specimens i. It was sometimes only to be observed for a short distance from the sieve-plate, but in other cases extended throughout the length of the element. It was found lo occur in sieve-tubes where the callus formed a very thick deposit on the sieve-plates, as well as in others where no callus was present. The walls of some few sieve-tubes in the root were slightly lignified (chiefly close to the sieve-plate) in two or three plants, but no general lignification of the.phloem in the root was observed. From the observations described above it appears that the walls of the phloemelements in the stem, and the contents of the sieve-tubes in the root become normally lignified in the sunflower, and the same phenomena occur in other species of Helianthus. The occurrence of lignified contents in the sieve-tubes of the root of H. tuberosus shows that this, feature is not restricted to annual species. L. A. BOODLE. Jodrell Laboratory, Kew. GERMINATION OF THE SPORES OF OPHIOGLOSSUM.--During a recent visit to Java, attempts were made by the writer to germinate the spores of several species of Ophioglossum. Three species--0. Moluccanum, O. intermedium, and O. pendulum, germinated, and in all of these the earliest stages were observed. O. Moluccanum germinates very freely and quickly, the first germination stages having been met with within three days. In this species a small amount of chlorophyll was sometimes found, but it was insufficient to enable the young prothallium to develop independently, and the largest ones had but four cells.'" Germination in O. intermedium was much slower. Only a small amount of this rare species was available, and the observations were necessarily very incomplete. About a month after the spores were sown, the first stages were fou...


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Product Details
  • ISBN-13: 9781235690501
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 200
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1235690504
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 367 gr


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