Whisk ferns, comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
English: Psilopsida, class Psilopsida, Psilotatae, class Psilotatae
Psilopsida, Psilotatae, class Psilopsida, class Psilotatae
English: Psilopsida, class Psilopsida, Psilotatae, class Psilotatae