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Definitions of pteridospermae
  1. noun
    used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
Definition that contains pteridospermae
  • seed fern an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
  • pteridosperm an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
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