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.
Psilotaceae - http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/psilotum2.htm Description and illustration of anatomical structure of species in Hawaii
Psilophyta - http://www.botany.hawaii.edu/faculty/webb/BOT201/PSILOTUM/Psilophyta-1.htm Profusely illustrated description focussed on morphology and evolution.
Introduction to the Psilotales - http://www.ucmp.berkeley.edu/plants/pterophyta/psilotales.html Includes descriptions of morphology and life history.
Classification of Psilotophyta - http://sn2000.taxonomy.nl/Main/Classification/95997.htm Main entry in Systema Naturae 2000.
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.
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