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Ferns and Fern Allies of Wisconsin
Key

1. Megaspores with numerous spines on the surface.
  Isoetes echinospora
1. Megaspores with curving ridges on the surface.   Isoetes lacustris


Key to ferns (start)
Glossary of terms
Introduction to ferns
List of all Pteridophytes
Contact the author
Acknowledgments
UW-Green Bay Herbarium homepage