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nounfossil gymnospermous trees or climbing plants from the Devonian: seed fernstype of:
Definition that contains cycadofilicales
- group pteridospermae used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- pteridospermaphyta used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- group pteridospermaphyta used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales
- 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)
- pteridospermae used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales