For sites about both ferns (Polypodiophyta) and their allies: horsetails (Equisetophyta), club mosses (Lycopodiophyta), and whisk-ferns (Psilotophyta).
Australian National Herbarium Fern Pages
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Comprehensive information about the taxonomy and distribution of Australian and Papuasian ferns and allies, as well as general information about pteridophytes.
2.
British Pteridological Society
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Images and information about ferns and other pteridophytes; activities of the society including publication of the Fern Gazette, Pteridologist, and Bulletin.
3.
Checklist of World Ferns
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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
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Personal site with a classification scheme, bibliography, some local checklists (Ohio and Kentucky), and an article on ferns and soil conservation.