Australian National Herbarium Fern Pages
- Comprehensive information about the taxonomy and distribution of Australian and Papuasian ferns and allies, as well as general information about pteridophytes.
- http://www.anbg.gov.au/fern/index.html

Pteridophytes: The Ferns and their Allies
- A classification of the ferns and their allies - a work in progress at the Australian National Herbarium.
- http://www.anbg.gov.au/fern/taxa/classification.html

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.
- http://homepages.caverock.net.nz/~bj/fern/

Natural Perspective - Ferns and Allies (Filicinophyta)
- Brief introduction.
- http://www.perspective.com/nature/plantae/ferns.html

Images of Pteridophyta
- Part of the W3Tropicos database at the Missouri Botanical Garden.
- http://mobot.mobot.org/Pick/Search/image/iix0.html

British Pteridological Society
- Images and information about ferns and other pteridophytes; activities of the society including publication of the Fern Gazette, Pteridologist, and Bulletin.
- http://www.nhm.ac.uk/hosted_sites/bps/

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.
- http://www.frognet.net/~jaknouse/ferns.htg/ferns.html

Field Systematic Botany - Pteridophytes: an Overview
- A detailed introduction to the ferns and fern allies.
- http://www.csdl.tamu.edu/FLORA/fsb/fsbfern1.htm

Introduction to the Pteridophytes
- An illustrated introduction to the ferns and fern allies for undergraduate students.
- http://scitec.uwichill.edu.bb/bcs/bl14apl/pter1.htm