Definition that contains order cycadofilicales
- 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
- 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)