Another term for pteridosperm.
- One example, from the Calhoun Flora of Illinois, is a seed fern that bears prepollen (a kind of microspore) far bigger than any known wind-dispersed pollen.
- Glossopteris, for example, was an extinct seed fern with distinctive leaf patterns.
- There is some agreement that both living and extinct cycads were derived from seed ferns, but paleobotanists still debate exactly if, when, and how this happened.
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