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

pteridosperm

/ˈtɛrɪdəʊspəːm

noun

A fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period. Also called seed fern.

Formerly placed in their own taxon (class Pteridospermeae), but now included with the gymnosperms.

The idea that cycads stem from Carboniferous so-called pteridosperms (‘seed ferns’ or seed plants with fern-like foliage) has long been popular with paleobotanists....

The Pteridopsida were present, bearing spores on their leaves as they do today, but there were also fernlike seed-bearing ferns, the pteridosperms.
The first seeds evolved in a group of vascular plants sometimes called the pteridosperms, or ‘seed ferns.’

Origin

Early 20th century: from modern Latin pteridospermeae, from Greek pteris, pterid- 'fern'.

单词	pteridosperm
释义	pteridosperm /ˈtɛrɪdəʊspəːm / noun A fossil plant which is intermediate between the ferns and seed-bearing plants, dying out in the Triassic period. Also called seed fern. Formerly placed in their own taxon (class Pteridospermeae), but now included with the gymnosperms. The idea that cycads stem from Carboniferous so-called pteridosperms (‘seed ferns’ or seed plants with fern-like foliage) has long been popular with paleobotanists.... The Pteridopsida were present, bearing spores on their leaves as they do today, but there were also fernlike seed-bearing ferns, the pteridosperms. The first seeds evolved in a group of vascular plants sometimes called the pteridosperms, or ‘seed ferns.’ Origin Early 20th century: from modern Latin pteridospermeae, from Greek pteris, pterid- 'fern'.
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