- American Fern Society - Information on the biology and cultivation of ferns; activities of the society including a spore exchange and publication of Fiddlehead Forum, American Fern Journal, and Pteridologia.
- Cold-hardy Tree Ferns - Well illustrated site that describes cold-hardy tree ferns and their cultivation in cool climates.
- Hardy Fern Foundation - A club established to develop a comprehensive collection of the world's hardy ferns for display, testing, evaluation, public education, and introduction for gardening and horticulture.
- Los Angeles International Fern Society - Information about the society's activities, ferns, and fern allies.
- San Diego Fern Society - Information on fern culture and the activities of the society plus lists of books and experts.
- Staghorn Ferns for Florida - University of Florida provides general details on the plant including lighting, watering and fertilization.
- Texas Gulf Coast Fern Society - Introduction, events, and links to other societies and sites of pteridological interest.
