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pteridosperm
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Definitions of pteridosperm in various dictionaries:
noun - an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
PTERIDOSPERM - The term Pteridospermatophyta (or "seed ferns" or "Pteridospermatopsida") refers to several distinct groups of extinct seed-bearing plants (spermatop...
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Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing seeds instead of spores |
an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) |
A fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period. |
Pteridosperm might refer to |
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The term Pteridospermatophyta (or "seed ferns" or "Pteridospermatopsida") refers to several distinct groups of extinct seed-bearing plants (spermatophytes). The earliest fossil evidence for plants of this type is the genus Elkinsia of the late Devonian age. They flourished particularly during the Carboniferous and Permian periods. Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though some pteridosperm-like plants seem to have survived into Eocene times, based on fossil finds in Tasmania.The concept of pteridosperms goes back to the late 19th century when palaeobotanists came to realise that many Carboniferous fossils resembling fern fronds had anatomical features more reminiscent of the modern-day seed plants, the cycads. In 1899 the German palaeobotanist Henry Potonié coined the term "Cycadofilices" ("cycad-ferns") for such fossils, suggesting that they were a group of non-seed plants intermediate between the ferns and |