== Kilder/Referencer ==
* [http://tolweb.org/tree?group=Filicopsida&contgroup=Embryophytes Tree of Life: Filicopsida] {{Webarchive|url=https://web.archive.org/web/20090114115915/http://tolweb.org/tree?group=Filicopsida&contgroup=Embryophytes |date=14. januar 2009 }}
* [http://tolweb.org/tree?group=leptosporangiate_ferns&contgroup=Filicopsida Tree of Life: Leptosporangiate ferns] {{Webarchive|url=https://web.archive.org/web/20031204002808/http://tolweb.org/tree?group=leptosporangiate_ferns&contgroup=Filicopsida |date= 4. december 2003 }}
* [http://sn2000.taxonomy.nl/Main/Classification/120715.htm Systema Naturae 2000: Phylum Filicinophyta] {{Webarchive|url=https://web.archive.org/web/20030928043819/http://sn2000.taxonomy.nl/Main/Classification/120715.htm |date=28. september 2003 }}
* Familien der Farne und Samenpflanzen (www.botgarden.uni-tuebingen.de/FamFarSa.html – {{Dødt link}}
* [http://www.csupomona.edu/~jcclark/classes/bot125/resource/survey/pterophyta.html Survey of the botanical Phyla: Pterophyta] {{Webarchive|url=https://web.archive.org/web/20031204041341/http://www.csupomona.edu/~jcclark/classes/bot125/resource/survey/pterophyta.html |date= 4. december 2003 }}
* [http://biologi.uio.no/plfys/haa/system/spore.htm Pteridophyta – Karsporeplanter] (PS: Pteridophyta != Karsporeplanter)
Geologi