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Combining Characters of Pteridaceae and Tree Ferns: Pterisorus Radiata gen. et sp. nov., A Permineralized Lower Cretaceous Filicalean with Radial Sori

  • Author(s) / Creator(s)
  • An anatomically preserved leptosporangiate filicalean that combines characters of the Pteridaceae and tree ferns has been discovered in the Lower Cretaceous (Valanginian-Hauterivian boundary) Apple Bay flora on Vancouver Island, Canada. Exindusiate sori are radial, with numerous annulate sporangia diverging from a conical receptacle that is positioned below a pinnule vein. No paraphyses or other trichomes are present. Sporangia have a nearly vertical annulus that is not interrupted by the long, quadriseriate stalk. Spores are trilete and angular, with a distinctive equatorial flange and a distal deltoid structure that contacts the rim at the corners of the spore. The suture extends three-fourths of the distance to the margin and is flanked by prominent ridges. Spore walls consist of two dense layers, and the surface is psilate. Pterisorus radiata gen. et sp. nov. has characters that are reminiscent of both tree ferns and the most highly derived of modern species, providing direct evidence for the third major radiation of Filicales.

  • Date created
    2006
  • Subjects / Keywords
  • Type of Item
    Article (Published)
  • DOI
    https://doi.org/10.7939/R3ZG6GJ32
  • License
    Copyright 2006 by The University of Chicago
  • Language
  • Citation for previous publication
    • Rothwell, G. W., & Stockey, R. A. (2006). COMBINING CHARACTERS OF PTERIDACEAE AND TREE FERNS : PTERISORUS RADIATA GEN . ET SP . NOV ., A PERMINERALIZED LOWER CRETACEOUS FILICALEAN WITH RADIAL SORI. International Journal of Plant Sciences, 167(3), 695-701.