Annals of Botany Volume 7

Annals of Botany Volume 7

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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. 1893 edition. Excerpt: ... that the inner surface of the pitcher is characterized by its structure as the transpiring surface par excellence of the plant, this being indicated both by the presence of spongy parenchyma in this region only, and by the relatively large number of its stomata. On the outer surface of the older pitchers we occasionally observed patches of periderm, developed under the stomata. In these cases the stomata were sometimes replaced by lenticels. In some instances a formation of callus on the inner surface of the pitcher was observed, as described by Treub. This was no doubt the result of injury. s The structure of the petiole of pitcher and leaf is essentially the same. The meristele of the pitcher is the larger and its xylem very much more abundant, as we should expect from the much greater size of the organ to be supplied. In the petiole of the leaf the meristele is slightly concave towards the upper surface; in that of the pitcher the curvature is much more marked. It is interesting to find that in the pitcher-petiole there is an active cambium between the xylem and the normal phloem, by which new elements are continually added to both tissues, the older phloem-elements consequently becoming obliterated. There is also a cambial increase of the superior or internal phloem, with resulting obliteration. Nothing of this kind occurs in the petiole of the ordinary leaf. This difference is evidently correlated with the long duration of life of the pitchers as contrasted with the transitory existence of the very caducous leaves. The Purple Colorat1on Of The Inner Surface Of The P1tcher. This was especially studied in the specimens from Burmah. The pigment was very well developed, giving the inside of the pitcher a fine deep purple colour, more

Product details

  • Paperback | 174 pages
  • 189 x 246 x 9mm | 322g
  • United States
  • English
  • black & white illustrations
  • 1236517245
  • 9781236517241