Polypodium vulgare
- Several photographs of Polypody and its identifying features.
- http://www.plant-identification.co.uk/skye/polypodiaceae/polypodium-vulgare-agg.htm

Polypodium virginianum
- Some information and two photographs of the Common Polypody including one showing the spore-bearing structures.
- http://www.ct-botanical-society.org/ferns/polypodiumvirg.html

Polypodium scouleri
- Photos and growing guide.
- http://www.rainyside.com/features/plant_gallery/nativeplants/Polypodium_scouleri.html

Polypodium
- Life cycle of a common fern.
- http://biodidac.bio.uottawa.ca/Thumbnails/PTER001B-GIF.htm

Polypodium interjectum
- Image from France.
- http://www.univ-lehavre.fr/cybernat/pages/polyinte.htm

Polypodium triseriale Sw.
- Taxonomic data and mapped distribution from Atlas of Florida Vascular Plants.
- http://www.plantatlas.usf.edu/main.asp?plantID=4030

Polypodium pellucidum
- Close up image of underside of leaf showing sori.
- http://www.botany.hawaii.edu/faculty/carr/images/pol_pel.jpg