File:Paléontologie végétale cryptogames cellulaires et cryptogames vasculaires (1914) (14760411251).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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souvent, les axes principaux des Sligmariaquittaient chaque tige aérienne au nombre de quatre(fig. 38), et leurs lignes de contact dessinaient à labase de cette tige un double sillon en forme de croix. En outre, chacun deux se dichotomisait au moinsdeirx fois ; mais, souvent, il demeurait indivis jusquàune assez grande distance de son extrémité proximale. Dans certains cas, par suite de subdivisions préma-turées, le nombre de ces axes principaux pouvait aug-menter plus ou moins dès la base des tiges aériennes,sur laquelle on ne remarque plus alors de doublesillon en forme de croix. Williamson a précisémentschématisé le contour de la base dun spécimen pourvude douze branches stigmariennes, parmi lesquelles on nesaurait distinguer quatre axes initiaux 3. Il a décrit également un échantillon de Stigmaria 1. Williamson, A monograph... (loc. cit.), p. fi. 2. Ibid., p. 6. 3. Ibid., p. 7-8, et Xylograph 2. ST1GMAIUA ï79 ficoides remarquable en raison de son excellente con-
Text Appearing After Image:
vm Fig. 38. — Diagramme indiquant la disposition relative des appen-dices dans un énorme Stigmaria rencontré dans le grès carboni-fère de Glayton, près Bradford (Yorkshire). A,B,G,D servent à désigner les quatre appendices principaux, issus de labase de la tige aérienne, et qui apparaissent dichotomisés deux fois ; —a li représentent leurs premières ramifications ; — et I-XVI, leursramifications de second ordre (daprès Williamson). servation, et de son mode dorganisation très net sui-vant le type normal dont il a été question précédem- l8o CR1PT0GAMES VASCUL AIRES ment i. La substance cle cet échantillon, décou-vert à Clayton, près de Bradford (Yorkshire), étaitidentique à celle de la roche gréseuse clans laquelle ilétait contenu. Il reposait en outre sur une roche schis-teuse, à la surface de laquelle il étendait, dune manièretrès régulière, ses quatre branches stigmariennes rayon-nantes, deux fois dichotomes. Ces dernières, quoiqueincomplètes,

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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:210
  • bookcollection:uconn_libraries
  • bookcollection:americana
  • BHL Collection
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28 July 2014

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