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No they are not the most primitives see for example:

  • Pryer, Kathleen M., Harald Schneider, Alan R. Smith, Raymond Cranfill, Paul G. Wolf, Jeffrey S. Hunt , Sedonia D. Sipes. 2001. "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature 409: 618-622 (pdf here).
  • A. R. Smith, K. M. Pryer, E. Schuettpelz, P. Korall, H. Schneider, P. G. Wolf. 2006. "A classification for extant ferns". Taxonomy 55(3), 705-731 (pdf here)