Meaning of CLASS PSILOPSIDA

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WordNet Dictionary
	Definition:		[n]  whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
	Synonyms:		class Psilotatae, Psilopsida, Psilotatae
	See Also:		class, division Pteridophyta, order Psilotales, Psilotales, Pteridophyta