#class_Psilopsida__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
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member of:  division_Pteridophyta
  member:  order_Psilotales__Psilotales  lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots
     member:  family_Psilotaceae__Psilotaceae  small family of lower ferns having nearly naked stems and minute scalelike leaves
        member:  genus_Psilotum__Psilotum  type genus of the Psilotaceae
           member:  whisk_fern__whiskfern  chiefly tropical clump-forming plants of skeletal appearance resembling whisk brooms; lacking roots

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