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nounan extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
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Definition that contains pteridosperm
- 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)