Horsetails 21-IV
TRACHEOPHYTA
Polypodiopsida
 
 
Horsetails



Chapter Outline
  1. Description of Tracheophyta
  2. Classification of Tracheophyta
  3. Lycopodiopsida
  4. Polypodiopsida
  5. Polypodiidae

Tree



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Polypodiopsida is the class that is dominated by the ferns. But it also contains three subclasses that are less well-known. Those subclasses are the focus of this page.
  • Polypodiopsida
    • Equisetidae
    • Marattiidae
    • Ophioglossidae
    • Polypodiidae - Ferns (next page)

Resources:

EQUISETIDAE 

This is the subclass of Horsetails. As of 2024, 16 species of Equisetidae have been observed in iNaturalist in the US and 29 throughout the world.

  • Field Horsetail (Equisetum arvense) - most iNat observations in the US for Equisetidae - 8 (Lake Michigan shore), 2 (Great Smoky Mountains NP)
  • Rough Horsetail (Equisetum hyemale) - 7 (Yosemite), 5 (Ecola SP), 8 (Field Museum), 6 (Schoenberg Temperate House at MOBOT) - NOAH
Resources:

MARATTIIDAE 

This is the subclass of Potato Ferns and Allies. As of 2024, 2 species of Marattiidae have been observed in iNaturalist in the US, only one of which is native, and 45 throughout the world.

  • Hawaii Potato Fern (Marattia douglasii) - most native iNat observations in the US for Marattiidae - 12 (Hawaii)
  • Giant Fern (Angiopteris sp.) - Climatron at MOBOT - NOAH
Resources:

OPHIOGLOSSIDAE 

This is the subclass of Adder's-Tongues, Fork Ferns and Allies. As of 2024, 52 species of Ophioglossidae have been observed in iNaturalist in the US and 97 throughout the world.

  • Rattlesnake Fern (Botrypus virginianus) - most iNat observations in the US for Ophioglossidae - Woodland Garden at MOBOT
  • Grape Ferns (Botrychium spp.) - Great Smoky Mountains NP
  • Psilotum nudum - 2 (Everglades), 6 (Greenhouse at MOBOT, not open to the public)
Resources:

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