The Whisk fern reference article from the English Wikipedia on 24-Jul-2004
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Whisk fern

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Whisk Fern
Closeup of the branches of a whisk fern, Psilotum nudumEnlarge

Closeup of the branches of a whisk fern, Psilotum nudum

Scientific classification
Domain:Eukaryota
Kingdom:Plantae
Subkingdom:Tracheobionta
Division:Psilotophyta
Class:Psilotopsida
Order:Psilotales
Family:'''Psilotaceae
Genus:Psilotum
Species
  • Psilotum nudum (L) Beauvois - Whisk Fern
  • Psilotum complanatum Sw. - Whisk Fern

The whisk ferns, traditionally thought not to be true ferns, are odd, "primitive" vascular plants that reproduces solely by spores, without seeds. Recent evidence has suggested that they may in fact be ferns that have lost a number of pteridophytic characteristics, but their status is still uncertain.

There are two species, as listed in the taxobox, with a hybrid known: Psilotum x intermedium W. H. Wagner.

The distribution of Psilotum is tropical and subtropical, in the New World, Asia, and the Pacific. The highest latitudes known are in South Carolina and southern Japan for P. nudum.