File:Paléontologie végétale cryptogames cellulaires et cryptogames vasculaires (1914) (14761226644).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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q. La majorité des côtes ainsi surajoutées ne proviennent.pas de la bifurcation de côtes situées à un niveauinférieur ; elles commencent à apparaître entre cesdernières, et elles sont alors étroites et pointues,comme celles qua observées M. Zeiller dans deux spé-cimens appartenant, lun au S. lœvigata Brgnt., lautreau S. tessellata Brgnt. 2. Tiges décortiquées. —- Il peut arriver que les tigesdes Sigillaires, comme celles des Lepidodendron,aient été dépouillées dune épaisseur plus ou moinsgrande de leur écorce externe, avant la fossilisation. Cesont de tels échantillons que Sternberg a désignés sousles noms génériques de Syringodendron et Catenaria. 1. Kidston, On the fossil Flora of tkc Yorkshire coal-field (toc. cit.)tp. 46, 47. 2. Flore fossile du bassin houiller de Valenciennes, p. 520, 566 ; pi. 78,fig. 3, et pi. 85, fig. i. SÏGILLARIA i57 Schimper a figuré un spécimen de S. tessellata trèsintéressant en ce que lon peut observer à sa périphérie
Text Appearing After Image:
Fig. 33, — Sigiltaria tessellata : vue superficielle dune tige plusou moins décortiquée dans une partie de son étendue. ep, Surface de la région non décortiquée, montrant les coussinets foliairesavec la trace du faisceau ligneux et celles des deux groupes de parichnos ;— c1, surface subépidermique ; — c2, surface encore plus profonde,présentant les caractères du type Syringodendron (daprès Schimper). des surfaces plus ou moins profondes, suivant lesrégions considérées (voir fig. 33). A un certain endroit I 58 CRYPTOGAMES VASCULAIRES (ep), on remarque la surface extérieure même de latige primitive, avec des cicatrices foliaires très nettes.Ailleurs (c d), on ne rencontre plus de cicatrices, lesassises les plus externes de lécorce ayant disparu, maison observe encore nettement les traces de faisceauxfoliaires. Enfin, dans le reste de son étendue (c 2), le spé-cimen considéré est dépouillé dune épaisseur de sonécorce encore plus considérable. On y distingu

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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:188
  • bookcollection:uconn_libraries
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
28 July 2014

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