, 29:3 | Cite as

The systematic position of Psilotum and Tmesipteris

  • David W. Bierhorst


Several interpretations concerning the relationships of the Psilotaceae are discussed. The conclusion that the Psilotaceae are filicalean ferns is defended. New evidence which has appeared since earlier papers on the subject confirms this basic conclusion.


Apical Cell Stem Apex Aerial Shoot Ultimate Segment Leaf Apical Cell 
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Copyright information

© The New York Botanical Garden 1977

Authors and Affiliations

  • David W. Bierhorst
    • 1
  1. 1.Department of BotanyUniversity of MassachusettsAmherst

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