Psilopsida

Từ điển WordNet v3.1 - WordNet Dictionary

noun

whisk ferns;
comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
• Syn:
class Psilopsida, Psilotatae, class Psilotatae
• Hypernyms:
class
• Member Holonyms:
Pteridophyta, division Pteridophyta
• Member Meronyms:
Psilotales, order Psilotales