英语词汇“seed fern”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	seed fern
释义	seed fern noun 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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