psilopsida
English Thesaurus
1. whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs (noun.plant)
hypernym | : | class, |
definition | : | (biology) a taxonomic group containing one or more orders (noun.group) |
member holonym | : | order psilotales, psilotales, |
definition | : | lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots (noun.plant) |
member meronym | : | division pteridophyta, pteridophyta, |
definition | : | containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta (noun.plant) |
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