whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
[ Syn: psilopsida , class psilopsida , psilotatae , class psilotatae ]
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
[ Syn: psilopsida , class psilopsida , psilotatae , class psilotatae ]