- Psilophytales, order Psilophytales - Paleozoic simple dichotomously branched plants of Europe and eastern Canada including the oldest known vascular land plants
--1 is a kind of plant order
--1 is a member of Pteridophyta, division Pteridophyta
--1 has members:psilophyte; Psilophytaceae, family Psilophytaceae; Rhyniaceae, family Rhyniaceae