George Yatskievych
Contributor
Curator, Missouri Botanical Garden.
Primary Contributions (32)
Whisk fern, either of the two species of the primitive fern genus Psilotum in the family Psilotaceae of the order Psilotales and the class Psilotopsida of the division Pteridophyta (the lower vascular plants). A whisk fern has water- and food-conducting tissues but lacks true leaves and roots.β¦
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