Cross section of Psilotum stem
- Photomicrograph of a stem x.s. of Psilotum nudum.
- http://www.uri.edu/cels/bio/plant_anatomy/79.html

Psilotum meiosporangium
- Photomicrograph of cross section.
- http://www.csupomona.edu/~jcclark/classes/bot125/resource/graphics/psi_psi_msg.html

Psilotum nudum
- Entry from NatureServe includes distribution map for the USA and conservation status by state.
- http://www.natureserve.org/explorer/servlet/NatureServe?searchName=PSILOTUM+NUDUM

Gene order
- Psilotum nudum genome.
- http://www.rs.noda.sut.ac.jp/~kunisawa/order/Pnu.html

Whisk Fern, Psilotum nudum
- Illustrated description from plants of southern Florida.
- http://fig.cox.miami.edu/~scofield/sofl_plants/fern_psilotum_nudum.html

The puzzle of Psilotum
- Is Psilotum primitive or a fern?
- http://taggart.glg.msu.edu/bot335/psilotum.htm

Psilotum nudum (L.) P.Beauv.
- Taxonomic data, photographic image and mapped distribution from Atlas of Florida Vascular Plants.
- http://www.plantatlas.usf.edu/main.asp?plantID=2108

Psilotum nudum (L.) Griseb.
- Detailed accession record from University of Connecticut.
- http://florawww.eeb.uconn.edu/acc_num/198500935.html