Definition of seed fern in English:

seed fern

noun

another term for pteridosperm
Example sentencesExamples
- 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.
- 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.
- Large plants were dominantly conifers, followed by lesser amounts of cycads, seed ferns, and ginkgos.
- Furthermore, many of these so called ‘preferns’, have been previously - and often equally convincingly - assigned to such varied groups as lycopsids, seed ferns, and intermediates between sphenopsids and ferns.
- Glossopteris, for example, was an extinct seed fern with distinctive leaf patterns.

Definition of seed fern in US English:

seed fern

noun

another term for pteridosperm
Example sentencesExamples
- 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.
- Furthermore, many of these so called ‘preferns’, have been previously - and often equally convincingly - assigned to such varied groups as lycopsids, seed ferns, and intermediates between sphenopsids and ferns.
- 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.
- Large plants were dominantly conifers, followed by lesser amounts of cycads, seed ferns, and ginkgos.

单词	seed fern
释义	Definition of seed fern in English: seed fern noun another term for pteridosperm Example sentencesExamples 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. 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. Large plants were dominantly conifers, followed by lesser amounts of cycads, seed ferns, and ginkgos. Furthermore, many of these so called ‘preferns’, have been previously - and often equally convincingly - assigned to such varied groups as lycopsids, seed ferns, and intermediates between sphenopsids and ferns. Glossopteris, for example, was an extinct seed fern with distinctive leaf patterns. Definition of seed fern in US English: seed fern noun another term for pteridosperm Example sentencesExamples 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. Furthermore, many of these so called ‘preferns’, have been previously - and often equally convincingly - assigned to such varied groups as lycopsids, seed ferns, and intermediates between sphenopsids and ferns. 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. Large plants were dominantly conifers, followed by lesser amounts of cycads, seed ferns, and ginkgos.
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