File:Paléontologie végétale cryptogames cellulaires et cryptogames vasculaires (1914) (14763223542).jpg

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Identifier: paleontologieveg00pelo (find matches)
Title: Paléontologie végétale cryptogames cellulaires et cryptogames vasculaires
Year: 1914 (1910s)
Authors: Pelourde, Fernand
Subjects: Paleobotany
Publisher: Paris, O. Doin
Contributing Library: University of Connecticut Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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ux dont lapartie ligneuse, développée dune manière centrifuge,est assez réduite. Chacun de ces faisceaux possède, ducôté interne, un canal dans lequel on observe souvent desdébris de trachées. Les tiges adultes montrent en dehors du bois primaireun anneau de bois secondaire plus ou moins épais (fig. 4),dont la présence, nécessitée par la grande taille de cestiges, ne saurait constituer une différence systématiquefondamentale entre les Calamités et les Equisetum. Onsait dailleurs que, dans les nœuds de Y Equisetum Tel-mateia Ehrh., il a été observé également des indicesde formations secondaires d. Chez les Calamités, la disposition des faisceaux de i. Cormack, On a cambial development in Equisetum (Ann. of Bot., Vil, i893>. 28 CRYPTOGAMES YASCULAIRES bois primaire est généralement la même que chez lesEquisetum. Le faisceau de chaque feuille, lorsquil entredans la tige, demeure indivis tout le long de Tentre-nœud situé en-dessous de son point dinsertion sur
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p Fig 4- — Coupe transversale, incomplète, dune tige de Calamo-dendron intermedium, montrant la partie interne de deux faisceauxpourvus de bois secondaire. />, moelle ; px, premiers vaisseaux, situés à lintérieur de la lacune qui cor-respond à chaque faisceau ; x, bois secondaire de chaque faisceau ; —/, portions latérales sclérifiées des rayons médullaires ; — mr, portionsmédianes parenchymateuses des mêmes rayons (daprès B. Renault). cette dernière ; mais, lorsquil atteint le nœud suivant, il sebifurque, et ses deux ramifications se raccordent auxdeux faisceaux caulinaires voisins, lesquels proviennentde deux feuilles insérées sur le nœud en question, etalternent avec lui. ÉQUISETALES PALE0Z01QUES 29 Toutefois, chez les plus anciennes Calamités, ren-contrées dans le dévonien et le culm (Asterocalamites),les divers faisceaux, comme les côtes superficielles, nal-ternent pas aux articulations; chacun deux se continuetout le long de la tige à laquelle il

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  • bookid:paleontologieveg00pelo
  • bookyear:1914
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Pelourde__Fernand
  • booksubject:Paleobotany
  • bookpublisher:Paris__O__Doin
  • bookcontributor:University_of_Connecticut_Libraries
  • booksponsor:LYRASIS_Members_and_Sloan_Foundation
  • bookleafnumber:59
  • bookcollection:uconn_libraries
  • bookcollection:americana
  • BHL Collection
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28 July 2014

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