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Cross section of Psilotum stem

http://www.uri.edu/artsci/bio/plant_anatomy/79.html

Photomicrograph of a stem x.s. of Psilotum nudum.

http://www.rs.noda.sut.ac.jp/~kunisawa/order/Pnu.html

Psilotum nudum genome.

Psilotum meiosporangium

http://www.csupomona.edu/~jcclark/classes/bot125/resource/graphics/psi_psi_msg.html

Photomicrograph of cross section.

http://www.botany.hawaii.edu/faculty/carr/images/psi_nud_mid.jpg

Photographic image from Hawaii.

http://www.botany.hawaii.edu/faculty/carr/images/psi_nud_cu.jpg

Close-up photographic image from Hawaii.

http://www.botany.hawaii.edu/faculty/carr/images/psi_nud_hab.jpg

Habit image from Hawaii.

http://botit.botany.wisc.edu/images/401/Psilotophyta/Psilotum_nudum/

Image collection.

http://botit.botany.wisc.edu/courses/tour/Roomtwo-Ps.html

Description and two images.

http://www.plantoftheweek.org/week055.shtml

Image and cultivation suggestions for whisk fern.

http://www.botany.com/psilotum.html

Description and propagation methods.

http://www.mun.ca/biology/rlee/b2120/psilotum.html

A review of the evidence that Psilotum belongs with the ferns in the Polypodiophyta or that it is associated with early Devonian plants.

http://www.natureserve.org/explorer/servlet/NatureServe?searchName=PSILOTUM+NUDUM

Entry from NatureServe includes distribution map for the USA and conservation status by state.

Psilotum nudum (L.) Griseb.

http://florawww.eeb.uconn.edu/acc_num/198500935.html

Detailed accession record from University of Connecticut.

Psilotum nudum (L.) P.Beauv.

http://www.plantatlas.usf.edu/main.asp?plantID=2108

Taxonomic data, photographic image and mapped distribution from Atlas of Florida Vascular Plants.

The puzzle of Psilotum

http://taggart.glg.msu.edu/bot335/psilotum.htm

Is Psilotum primitive or a fern?

Whisk Fern, Psilotum nudum

http://fig.cox.miami.edu/~scofield/sofl_plants/fern_psilotum_nudum.html

Illustrated description from plants of southern Florida.