- Psilotales, order Psilotales - lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots
--1 is a kind of plant order
--1 is a member of Psilopsida, class Psilopsida, Psilotatae, class Psilotatae
--1 has members: Psilotaceae, family Psilotaceae