British Pteridological Society - Images and information about ferns and other pteridophytes; activities of the society including publication of the Fern Gazette, Pteridologist, and Bulletin.
Checklist of World Ferns - A compiled list of the ferns and fern allies of the world, with full botanical names, information about where they are found, and their classification.
Pteridophytes: Ferns and Fern Allies - Personal site with a classification scheme, bibliography, some local checklists (Ohio and Kentucky), and an article on ferns and soil conservation.
Pteridophytes: The Ferns and their Allies - Provides information on these ferns and their allies, their structure and classification, with keys and checklists of Australian species.
