蕨类植物;由松叶蕨科或裸蕨纲组成;无根脉管植物,叶仅部分分化或缺乏,孢子囊发育较差。

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