/tray"kee euh fuyt'/, n.
any plant of the former division Tracheophyta, comprising all the vascular plants.
[1935-40; < NL Tracheophyta name of the division. See TRACHEO-, -PHYTE]

* * *

      any of the vascular plants, members of the division, or phylum, Tracheophyta, numbering some 260,000 species and including all of the conspicuous flora of the Earth today. Tracheophyte, meaning “tracheid plant,” refers to the water-conducting cells (called tracheids (tracheid), or tracheary elements) that show spiral bands like those in the walls of the tracheae, or air tubes, of insects.

      The division comprises a tremendous diversity of plants among its four subgroups: psilopsids, leafless and rootless primitive forms commonly known as whisk ferns (though not true ferns); sphenopsids, feathery leaved plants commonly called horsetails; lycopsids, low-lying plants called club mosses; and pteropsids, comprising the ferns, gymnosperms (pines, spruces, firs, etc.), and flowering plants.

      The vascular system consists of xylem (wood), concerned mainly with the conduction of water and dissolved minerals, and phloem, which functions mainly in the conduction of foods, such as sugar.

      Tracheophytes are believed to have originated from the green algae (Chlorophyta). The earliest fossils are from Silurian (Silurian Period) rocks more than 400,000,000 years old.

* * *

Universalium. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • trachéophyte — ● trachéophyte nom féminin Synonyme de plante vasculaire. ● trachéophyte (synonymes) nom féminin Synonymes : plante vasculaire …   Encyclopédie Universelle

  • tracheophyte — [trā′kē ə fīt΄] n. [ TRACHEO + PHYTE] any vascular plant …   English World dictionary

  • tracheophyte — noun Etymology: New Latin Tracheophyta, from trache + Greek phyton plant; akin to Greek phyein to bring forth more at be Date: 1937 any of a division (Tracheophyta) comprising green plants (as ferns and seed plants) with a vascular system that… …   New Collegiate Dictionary

  • Trachéophyte — Tracheobionta Tracheobionta …   Wikipédia en Français

  • Tracheophyte — ? Сосудистые растения Спорофит риния, Безлистни (Bg) Научная классификация Царство: Растения Подцарство: Сосудистые растения …   Википедия

  • tracheophyte — noun Any plant possessing vascular tissue (xylem and phloem), including ferns, conifers, and flowering plants. Syn: vascular plant Ant: non vascular plant, tha …   Wiktionary

  • tracheophyte — tra·cheo·phyte …   English syllables

  • tracheophyte — tra•che•o•phyte [[t]ˈtreɪ ki əˌfaɪt[/t]] n. pln any plant of the former division Tracheophyta, comprising all the vascular plants • Etymology: 1935–40; < NL Tracheophyta. See tracheo , phyte …   From formal English to slang

  • tracheophyte — noun green plant having a vascular system: ferns, gymnosperms, angiosperms • Syn: ↑vascular plant • Hypernyms: ↑plant, ↑flora, ↑plant life • Hyponyms: ↑pterido …   Useful english dictionary

  • трахеофит — — [] EN tracheophyte A large group of plants characterized by the presence of specialized conducting tissues (xylem and phloem) in the roots, stems, and leaves. (Source: MGH)… …   Справочник технического переводчика

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”