division - (botany) taxonomic unit of plants corresponding to a phylum

kingdom Plantae, plant kingdom, Plantae - the taxonomic kingdom comprising all living or extinct plants

genus Pecopteris - genus of Carboniferous fossil ferns

nonflowering plant, pteridophyte - plants having vascular tissue and reproducing by spores

fern family - families of ferns and fern allies

fern genus - genera of ferns and fern allies

class Filicinae, class Filicopsida, Filicinae, Filicopsida - ferns

class Psilopsida, class Psilotatae, Psilopsida, Psilotatae - whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs

order Psilophytales, Psilophytales - Paleozoic simple dichotomously branched plants of Europe and eastern Canada including the oldest known vascular land plants

class Equisetatae, class Sphenopsida, Equisetatae, Sphenopsida - horsetails and related forms

class Lycopodiate, class Lycopsida, Lycopodiate, Lycopsida - club mosses and related forms: includes Lycopodiales; Isoetales; Selaginellales; and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta