- Psilotaceae - http://www.botany.hawaii.edu/faculty/carr/psilot.htm
Division/family description and thumbnail links to images of two species of Psilotum from Hawaii.
- Phylum Psilophyta - http://www.science.siu.edu/landplants/Psilophyta/psilophyta.html
Includes phylum description, and links to images of members of the Psilotaceae.
- Division Psilotophyta - http://www.esu.edu/~milewski/intro_biol_two/lab_2_moss_ferns/Psilophyta.html
Description with links to images of Psilotum nudum and Tmesipteris tannensis.
- Fork Ferns - http://www.hiddenforest.co.nz/plants/forkferns/forkferns.htm
Illustrated introduction to the five species of Psilotaceae found in New Zealand.
- Psilophyta - http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/Psilophyta-1.htm
Profusely illustrated description focussed on morphology and evolution.
- Psilotaceae - http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/psilotum2.htm
Description and illustration of anatomical structure of species in Hawaii
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