File:An Early Pennsylvanian flora with megalopteris and noeggerathiales from west-central Illinois (1977) (21096702436).jpg

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Title: An Early Pennsylvanian flora with megalopteris and noeggerathiales from west-central Illinois
Identifier: earlypennsylvani500lear (find matches)
Year: 1977 (1970s)
Authors: Leary, Richard L; Pfefferkorn, H. W. , joint author; Illinois State Museum
Subjects: Paleobotany; Paleobotany; Megaloptera; Flora (biologie); Fossielen
Publisher: Urbana : Illinois State Geological Survey
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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Text Appearing Before Image:
EAELY PENNSYLVANIA FLORA FROM WEST-CENTRAL ILLINOIS 15 The systematic position of the Noeggerathiales was always uncer- tain, and different workers arranged them quite differently in the sys- tem. Boureau (196I+, p. 1+81) lists the older suggestions. The Noeggera- thiales were compared with Ferns, Gymnosperms, and Tmesipteris (Browne, 1933; Bierhorst, 1971). Other authors considered them to be of uncer- tain position, and Boureau (1964) used a separate division, Noeggerathi- ophyta. Beck (1976) suggested the possibility that the Noeggerathiales might be the pteridophytic descendants of the Progymnosperms. We agree with Beck that the external morphological characters of several Noegger- athiales are very similar to the Archaeopteridales. The Noeggerathiales are characterized by heterospory, by cones of radial structure, and, in many specimens by wedge-shaped sterile pinnules (or leaves?) with open dichotomous venation. The sterile foliage closely resembles that of Archaeopteris. The heterospory is another characteristic common to Noeggerathiales and Progymnosperms. Structural and palynological infor- mation will be necessary to verify this hypothesis. The age distribution of all fructification and foliage genera that have any morphological similarities to Progymnosperms or Noeggera- thiales is shown in text figure 6. The figure shows that such forms are present throughout the Pennsylvanian and the lower Permian. It demon- strates at the same time how incomplete the record is. Any ideas about natural relationships between these genera would be premature. We do not even suggest that all genera shown belong to the same order or class, UPPER DEVONIAN Archaeopteris PERMIAN
Text Appearing After Image:
-Fructification Foliage Text fig. 6 - Stratigraphic ranges of foliage and fructifications of Progym- nosperms, Noeggerathiales, and similar foliage. S = Saaropteris, N = Noeggerathiostrobus, T = Tingiostachya, P = Palaeopteridium.

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https://www.flickr.com/photos/internetarchivebookimages/21096702436/

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Volume
InfoField
Information circular - Illinois State Geological Survey; (no. 500)
Flickr tags
InfoField
  • bookid:earlypennsylvani500lear
  • bookyear:1977
  • bookdecade:1970
  • bookcentury:1900
  • bookauthor:Leary_Richard_L
  • bookauthor:Pfefferkorn_H_W_joint_author
  • bookauthor:Illinois_State_Museum
  • booksubject:Paleobotany
  • booksubject:Megaloptera
  • booksubject:Flora_biologie_
  • booksubject:Fossielen
  • bookpublisher:Urbana_Illinois_State_Geological_Survey
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:19
  • bookcollection:university_of_illinois_urbana_champaign
  • bookcollection:americana
  • BHL Collection
Flickr posted date
InfoField
3 September 2015

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