strand tracheid

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• Xylem — Multiple cross sections of a flowering plant stem showing primary and secondary xylem and phloem[1] Xylem is one of the two types of transport tissue in vascular plants. (Phloem is the other). The word xylem is derived from the Classical Greek… …   Wikipedia

• Evolutionary history of plants — Plants have evolved through increasing levels of complexity, from the earliest algal mats, through bryophytes, lycopods, ferns and gymnosperms to the complex angiosperms of today. While the simple plants continue to thrive, especially in the… …   Wikipedia

• lower vascular plant — ▪ biology Introduction formerly  pteridophyte,  also called  vascular cryptogam,         any of the spore bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. Once considered of the… …   Universalium

• plant — plantable, adj. plantless, adj. plantlike, adj. /plant, plahnt/, n. 1. any member of the kingdom Plantae, comprising multicellular organisms that typically produce their own food from inorganic matter by the process of photosynthesis and that… …   Universalium

• wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …   Universalium

• Wood — /wood/, n. 1. Grant, 1892 1942, U.S. painter. 2. Leonard, 1860 1927, U.S. military doctor and political administrator. * * * I Hard, fibrous material formed by the accumulation of secondary xylem produced by the vascular cambium. It is the… …   Universalium

• Histoire évolutive des végétaux — Diversité des plantes modernes. Les végétaux ont évolué en atteignant des niveaux croissants de complexité, depuis les premières algues, en passant par les bryophytes, les lycopodes et les fougères, jusqu aux complexes gymnospermes et angios …   Wikipédia en Français

• Senescence — refers to the biological processes of a living organism approaching an advanced age (i.e., the combination of processes of deterioration which follow the period of development of an organism). The word senescence is derived from the Latin word… …   Wikipedia

• Siegenian — The Siegenian was an epoch of the Devonian period spanning from 411.2 +/ 2.8 To 407 +/ 2.8 Ma. The term overlaps with parts of the internationally recognised Pragian and Emsian epochs, and although once widely usedcite journal author = Niklas,… …   Wikipedia

• torus — /tawr euhs, tohr /, n., pl. tori /tawr uy, tohr uy/. 1. Archit. a large convex molding, more or less semicircular in profile, commonly forming the lowest molding of the base of a column, directly above the plinth, sometimes occurring as one of a… …   Universalium

• Baragwanathia — ▪ fossil plant genus       genus of early lycopsid plants (plant) that had true leaves (leaf) bearing a single strand of vascular tissue (vascular system) and kidney bean shaped sporangia arranged in zones along the stem. These features relate it …   Universalium