Polypodiophyta

• Marratiopsida
• Marsileopsida
• Ophioglossopsida
• Polypodiopsida
• Salviniopsida

• American Fern Society  - Presents the activities of the organization devoted to the worldwide propagation of this type of plant. Includes history, programs and publications.
• Connecticut Ferns  - Offers a guide to identifying members of this particular type of flora in the state. From the Connecticut Botanical Society.
• Fern Information  - Offers a listing of this type of vegetation found in Barbados. With illustrations and links to related sites.
• Ferns Identification Database  - Offers access to information on British ferns. With illustrations.
• Ferns of the Canberra Region  - Presents information on these specific plants in southeastern Australia. Includes listing, habitat, location, distinguishing features and images.
• Filicopsida  - Presents information on ferns as part of the Tree of Life Web Project. With pictures, references and links to related sites.
• Introduction to the Pteridopsida  - Presents an overview of this group of flora including its known representatives. With images and links to related sites.
• Phylum Pterophyta  - Describes the unique characteristics of this type of flora. With links to the various families belonging to this group.
• Thomas Moore Ferns of Great Britain and Ireland  - Offers a rare collection of prints of this particular type of vegetation. Includes price listing.