Pteridium aquilinum (Bracken)
- Images and 10km distribution map for this species. From Flora of Northern Ireland.
- http://www.habitas.org.uk/flora/species.asp?item=2031

Bracken Fern Carcinogenicity
- Summary of data reported and evaluation of bracken fern and some of its constituents.
- http://www.inchem.org/documents/iarc/vol40/brackenfern.html

France
- Illustrated description.
- http://www.com-nature.com/~fougere-fern/libraryGB/fernpagesGBtext/aquilinumGB.htm

Toxicity
- P. aquilinum page from "Poisonous Plants of North Carolina" by Dr. Alice B. Russell.
- http://www.ces.ncsu.edu/depts/hort/consumer/poison/Pteriaq.htm

Distribution in Utah
- From the Digital Atlas of the Vascular Plants of Utah.
- http://www.gis.usu.edu/Geography-Department/utgeog/utvatlas/family/poly3/ptaq.html

Pteridium aquilinum
- Photomicrograph of a cross section through a fern sorus.
- http://biodidac.bio.uottawa.ca/thumbnails/filedet.htm?File_name=PTER004P&File_type=GIF

References for Pteridium aquilinum
- List from the U.S. Department of Agriculture/Forest Service's Fire Effects Information System.
- http://www.fs.fed.us/database/feis/plants/fern/pteaqu/references.html

Southwest Colorado Wildflowers
- Image and description of Pteridium aquilinum.
- http://www.swcoloradowildflowers.com/Fern%20Enlarged%20Photo%20Pages/pteridium%20aquilinum.htm

Bracken
- Description, habitat and uses of Pteridium aquilinum.
- http://www.rook.org/earl/bwca/nature/ferns/pteridiumaqui.html