Usually means: Primitive ferns with simple structure.
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We found 7 dictionaries that define the word class psilopsida:

General (6 matching dictionaries)
  1. class Psilopsida: Vocabulary.com
  2. class psilopsida: Dictionary.com
  3. Class psilopsida: Rhymezone
  4. class psilopsida: FreeDictionary.org
  5. class psilopsida: Mnemonic Dictionary
  6. class Psilopsida: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. class Psilopsida: Encyclopedia

Definitions from WordNet (Class psilopsida)

noun:  whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs


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