- American Fern Society
 - Group of people interested in studying, growing, and preserving fern and fern-allies.  British Pteridological Society
- Provides information about ferns through its publications and other literature. Also organises formal talks, informal discussions, field meetings, garden visits, plant exchanges, a spore exchange scheme, and fern book sales.- Hardy Fern Foundation
- Established to provide a comprehensive collection of the world's hardy ferns for display, evaluation, public education, and introduction to the horticultural community.
- Los Angeles International Fern Society
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