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Contributions to Canadian Micro-Palaeontology Volume 1-2

Contributions to Canadian Micro-Palaeontology Volume 1-2


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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. 1883 Excerpt: ...can be seen. (Fig. 108.) In other instances, being flattened, they might be mistaken for scales. No spores could be observed in any of the specimens, though in some the surface was marked by slight rounded prominences, possibly the impressions of the spores within. This peculiar and very simple style of spore-case is also characteristic of P. robuitius, and gives to Psilophyton a very distinct generic character. These naked spore-cases may be compared with those of such lycopodiaceous plants as Psilotum, in which the scales are rudimentary. In the manner in which they are borne they resemble those of the leafy genus Tmesipteria. On the other hand they might be compared with the sporocarps, or involucres as they have been called, of Rhizocarpeaa, which, however, they do not at all resemble in their manner of growth. They might also be compared with the sporangia of the Hymenophylla and Ophioglossece among the ferns. In short, the species of Psilophyton were synthetic or generalised plants, having rhizomata resembling those of some ferns, stems having the structure of Lycopodmm, and rudimentary leaves also resembling those of Lycopodiaeece, branchlets with circinate venation like that of ferns, and Sporangia of a type quite peculiar to themselves. Some of my lately acquired specimens also show that in the mature and fertile stems of P. princeps the ridges became very strongly marked, and that the scattered leaflets became hard, spinose and prominent, confirming my previously expressed opinion that the plant was somewhat rigid and woody. This character is, however, perceptible only when the plants are preserved in such a manner as to show their rotundity. When flattened, they may appear as mere fibres of carbonaceous matter, and might, in fragments, readily be...


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Product Details
  • ISBN-13: 9781130821345
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 113082134X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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