Polypodiophyta

Ferns Around Washington, DC - http://members.aol.com/palmferndc/ferns/
A collection of images and information on ferns growing in the DC area.

British Fern Species - http://midwales.com/westhill/mydbfern/
Searchable database.

Introduction to the Ferns - http://www.ucmp.berkeley.edu/plants/pterophyta/pteridopsida.html
The ferns are an ancient lineage of plants, dating back to at least the Devonian. They include three living groups - Marattiales, Ophioglossales, and leptosporangiate ferns - as well as a couple of extinct groups.

Fern Siam - http://www.fernsiam.com/
Images, taxonomic information, online forum, and other resources about ferns in Thailand. Mostly in Thai language, with some English.

Ferns of the Canberra Region - http://www.home.aone.net.au/byzantium/ferns/
A site about ferns in southeastern Australia, their ecology, how to grow them, information on ferns in general, with numerous photographs.

Ferns Images - http://bryophytes.plant.siu.edu/diversityweb/ferns.html
Microscopic images of various parts and sections of ferns.

Filcalean Ferns - http://bryophytes.plant.siu.edu/diversityweb/Labs/Lab%2010/filicalean.html
Photographs of some ferns.

Native Ferns for Cool Climates - http://www.anbg.gov.au/ferns/ferns.html
Information on the cultivation of Australian native ferns with a species list.

Phylogeny and evolution of ferns (Monilophytes) - http://www.pryerlab.net/publication/fichier494.pdf
Scientific paper from American Journal of Botany 2004 showing that Psilotophyta and Equisetophya are in the Monilophyte clade with the other ferns.

Ferns of Great Britain and Ireland - http://rare-prints.com/ferns_main.htm
Small images of 39 antique prints by Thomas Moore, 1855.

Pterophyta - http://botit.botany.wisc.edu/courses/systematics/Phyla/Pterophyta/Pterophyta.html
Introduction to the systematics of the ferns, with family descriptions and images.

British Ferns - http://delta-intkey.com/britfe/
The Delta database provides botanical descriptions of all species found in the British Isles.

Leptosporangiate Ferns - http://tolweb.org/tree?group=Leptosporangiate_Ferns&contgroup=Filicopsida
Next to the flowering plants, the leptosporangiate ferns are the most diverse group of living land plants. Estimates place their diversity at about 12,000 species in around 300 genera. This page is part of the tree of life phylogeny project.

Filicopsida - http://tolweb.org/tree?group=Filicopsida&contgroup=Embryophytes
Introduction to ferns from the Tree of Life project.

American Fern Society - http://amerfernsoc.org/
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.

Gallery of Connecticut Ferns - http://www.ct-botanical-society.org/ferns/
Photos and brief information indexed by common and scientific names.

Ferns of Barbados - http://scitec.uwichill.edu.bb/bcs/staff/lec/ferns.htm
Checklist plus distribution data and links for each species.

Neotropical Fern Genera - http://131.230.176.4/cgi-bin/dol/dol_diagkey.pl?matrix=fernfamily4.winc&new=1
Key to the genera of neotropical ferns provided by PhytoImages.

Ferns et al of New England and Bermuda - http://www.nefern.info/
Lists all native pteridophyte species and some hybrids, with photographs of most and data pages for some.

Plant Diversity: Ferns in The Wet Tropics - http://www.wettropics.gov.au/pa/pa_ferns.html
Information and photographs of several ferns that grow in northern Australia.

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