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- Fork Ferns - Illustrated introduction to the five species of Psilotaceae found in New Zealand.
- Psilotaceae - Description and illustration of anatomical structure of species in Hawaii
- Classification of Psilotophyta - Main entry in Systema Naturae 2000.
- Division Psilotophyta - Description with links to images of Psilotum nudum and Tmesipteris tannensis.
- Psilophyta - Profusely illustrated description focussed on morphology and evolution.
- Introduction to the Psilotales - Includes descriptions of morphology and life history.
- Psilotaceae - Division/family description and thumbnail links to images of two species of Psilotum from Hawaii.
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