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

psilophyte

/ˈsaɪləfʌɪt/

noun

1 Ecology. A plant that is adapted for a dry savannah environment; the growth form characteristic of such a plant.

2 Botany and Palaeontology. Any of various extinct primitive vascular plants of the Upper Silurian and Devonian periods, lacking true roots and leaves but having a creeping rhizome and a cylindrical branching stem with a central vascular strand, sometimes bearing scales or leaf-like branchlets. Also: a member of the extant order Psilotales, comprising two genera (Psilotum and Tmesipteris) of small tropical and subtropical plants that superficially resemble these fossils.

The extant Psilotales were formerly classified in a division Psilophyta together with the fossil forms, but they are now thought to be more closely allied to ferns, and are often placed in a division called Psilotophyta. The fossil forms are now generally thought to represent a range of early vascular plant types, and probably not a unified group, some perhaps being related to the clubmosses..

Origin

Early 20th century. From psilo- + -phyte.

单词	psilophyte
释义	psilophyte /ˈsaɪləfʌɪt/ noun 1 Ecology. A plant that is adapted for a dry savannah environment; the growth form characteristic of such a plant. 2 Botany and Palaeontology. Any of various extinct primitive vascular plants of the Upper Silurian and Devonian periods, lacking true roots and leaves but having a creeping rhizome and a cylindrical branching stem with a central vascular strand, sometimes bearing scales or leaf-like branchlets. Also: a member of the extant order Psilotales, comprising two genera (Psilotum and Tmesipteris) of small tropical and subtropical plants that superficially resemble these fossils. The extant Psilotales were formerly classified in a division Psilophyta together with the fossil forms, but they are now thought to be more closely allied to ferns, and are often placed in a division called Psilotophyta. The fossil forms are now generally thought to represent a range of early vascular plant types, and probably not a unified group, some perhaps being related to the clubmosses.. Origin Early 20th century. From psilo- + -phyte.
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