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Botanical Gazette (Volume 16)

Botanical Gazette (Volume 16)


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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. 1891. Excerpt: ... On the organization of the fossil plants of the Coal-measures.1 DAVID WHITE. The following review contains so much of anatomical importance that we give it this more conspicuous place.--Eds The observations recorded in these three memoirs, while confined chiefly to types, most of which have been treated more or less in the preceding parts, are hardly less remarkable for the information they bring to bear on the mode of the formation of the medulla and the development of exogenous growth in certain Carboniferous cryptogams, than for the proof they furnish of the existence of an exogenous growth among the Carboniferous ferns. Part XV throws new light on the structure of the rhizomes and petioles belonging to Corda's genera Zygopteris and Anachoropteris, as recognized by Renault, Stenzel, and others, which Williamson shows to be generically equivalent. For these he prefers the name Rachiopteris proposed by himself in 1874 (Pt. VI, p. 677) "for a considerable number of these objects which appeared to be either rhizomes or petioles of ferns," for the reason that an examination of the structure of living ferns, classified by their fructification, shows that "no classification of fossil ferns based solely on the characters revealed in transverse sections of their petiolar bundles can be of value." Neither Prof. Williamson nor several other recent authors, seems to be aware of the coincident fact that Dawson in 1861 (Q. J. G. S. L., xviii, p. 323), with equal appropriateness, proposed the new genus Rhachiopteris " to include such Devonian stipes as indicate the existence of distinct species of ferns, of which the fronds have perished." Schimper does not seem to have known of Dawson's genus when he established his Rhacopteris (Traite, I, 1869, p. 481), based on t...


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Product Details
  • ISBN-13: 9781235745690
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 142
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1235745694
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr

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