» Classification of Psilotophyta Main entry in Systema Naturae 2000. http://sn2000.taxonomy.nl/Main/Classification/95997.htm
» Division Psilotophyta Description with links to images of Psilotum nudum and Tmesipteris tannensis. http://www.esu.edu/~milewski/intro_biol_two/lab_2_moss_ferns/Psilophyta.html
» Fork Ferns Illustrated introduction to the five species of Psilotaceae found in New Zealand. http://www.hiddenforest.co.nz/plants/forkferns/forkferns.htm
» Introduction to the Psilotales Includes descriptions of morphology and life history. http://www.ucmp.berkeley.edu/plants/pterophyta/psilotales.html
» Phylum Psilophyta Includes phylum description, and links to images of members of the Psilotaceae. http://www.science.siu.edu/landplants/Psilophyta/psilophyta.html
» Psilophyta Profusely illustrated description focussed on morphology and evolution. http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/Psilophyta-1.htm
» Psilotaceae Description and illustration of anatomical structure of species in Hawaii http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/psilotum2.htm
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