Fossil Plants as Tests of Climate; Being the Sedgwick Prize Essay for the Year 1892

Fossil Plants as Tests of Climate; Being the Sedgwick Prize Essay for the Year 1892

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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. 1892 edition. Excerpt: ...the connection between plant forms and structures and conditions of life, we must not entirely omit a reference to water-plants. Although not strictly within the limits of the present subject, the chief characteristics of plants living wholly or in part in water, may be briefly noted. Among Coal-measure plants, whose structures are more or less faithfully preserved, there are some which have been compared by palaeobotanists to plants living in swamps or submerged in water. In cases such as these it is of primary importance to have clearly before us the most constant and characteristic differences between land and water plants, and especially such as are likely to be detected in the mineralised tissues of fossil plants. The work of Dr H. Schenck' clearly demonstrates that waterplants, taken as a. whole, constitute a well-defined and natural 1 Schenck, H. (1), (2). IA group, both as regards external form and anatomical structure. In submerged plants the leaves are in nearly all cases finely divided or ribbon-shaped; their delicate structure is expressed in the relatively fewer layers of parenchymatous cells as compared with the leaves of land-plants, and mechanical tissue is very feebly developed. The substitution of diffused for direct sunlight results in the disappearance of pallisade tissue.-Submerged leaves are further conspicuous by their more delicate epidermal cells whose outer walls have a very thin cuticle, by the absence of stomata and of that dorsiventral structure so common in land-plants: moreover, in water-plants there is no need for any of the various checks to transpiration, which have been previously discussed '. In the leaves and stems of submerged plants the presence of large and small intercellular spaces and...show more

Product details

  • Paperback | 54 pages
  • 189 x 246 x 3mm | 113g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236809866
  • 9781236809865