A tracheid is a long and tapered lignified cell in the xylem of vascular plants. It is a type of conductive cell called a tracheary element. Angiosperms...

distinctive xylem cells are the long tracheary elements that transport water. Tracheids and vessel elements are distinguished by their shape; vessel elements...

sieve-tube elements. The xylem consists of vessels in flowering plants and of tracheids in other vascular plants. Xylem cells are dead hard-walled hollow cells...

gymnosperms, by having flowers, xylem consisting of vessel elements instead of tracheids, endosperm within their seeds, and fruits that completely envelop the...

parenchyma cells, fibers, vessels, tracheids, and ray cells. Longer tubes made up of individual cellssels tracheids, while vessel members are open at each...

lignin, a polymer used to strengthen the secondary cell walls of xylem tracheids and vessels to keep them from collapsing when a plant sucks water through...

fibre cells' evolutionary origin from tracheids exists.[citation needed] During evolution the strength of the tracheid cell walls was enhanced, the ability...

the cell wall that is perforated; present in vessel members but not in tracheids. Should not be confused with a pit. perianth The collective term for the...

suggest that by this period Sequoia ancestors had already evolved a greater tracheid diameter that allowed it to reach the great heights characteristic of the...

Cone-bearing plant Conifers Cones containing seeds and wood composed of tracheids 629 extant Prasinodermophyta Prasinoderma-like plants Picozoans, picobiliphytes...

tissue composed of water-conducting tracheids or vessel elements, together with fibres and parenchyma cells. Tracheids are elongated cells with lignified...

leaves. By the time they become competent to conduct water, all xylem tracheids and vessels have lost their cytoplasm and the cells are therefore functionally...

three directions, and strongly elongated tracheids. Tracheids make up more than 90% of timber volume. The tracheids of earlywood formed at the beginning of...

Sap is a fluid transported in xylem cells (vessel elements or tracheids) or phloem sieve tube elements of a plant. These cells transport water and nutrients...

trabs, trabis trabeculae trach- rough Greek τραχύς (trakhús) trachea, tracheids, tracheitis, tracheophyte, tracheostomy, tracheotomy, trachoma trag- he-goat...

roots to the shoots. Two kinds of cell are involved in xylem transport: tracheids and vessel elements. Vessel elements are the building blocks of vessels...

dimensions of lumens and the thickness of walls in the conducting cells (tracheids, vessels), fibers, and various ray properties. The structural attributes...

vessel elements in the gnetophytes were interpreted as being derived from tracheids with circular bordered pits, as in conifers. It however only gained strong...

gwynne-vaughanii that had xylem tracheids that were well reinforced by bands of lignin. The earliest macrofossils known to have xylem tracheids are small, mid-Silurian...

extent that the filter plates in the pores between the wood's component tracheids had rotted away, perhaps while the wood was stored in or under water in...

endophytes. Mosses differ from vascular plants in lacking water-bearing xylem tracheids or vessels. As in liverworts and hornworts, the haploid gametophyte generation...

Surrounding both conducting tissues was a broad sheath of transfusion tracheids. Below the leaf scar the leaf-cushion tapered to a basal position. In...

pectin components, especially in vascular and support tissues: xylem tracheids, vessel elements and sclereid cells.[citation needed] Lignin plays a crucial...

samples of the two parent species. Tracheid length might be slightly shorter than either parent, though tracheid length in southern pines usually does...

branching. It seems probable that the xylem, comprising a solid strand of tracheids, was centrarch.": 216  However, Edwards and Edwards also decided to include...

and wide". There was a central vascular cylinder consisting of annular tracheids (water-conducting cells with thickened walls). Six other species were...

widely used is now deprecated. Niklas, K.J. (1985). "The evolution of tracheid diameter in early vascular plants and its implications on the hydraulic...

they appear to have no (visible) pores because of the presence of tracheids. Tracheids are a primitive element of xylem (fluid-conducting tissues). They...

in structure to woody dicots except that most gymnosperms produce only tracheids in their xylem, not the vessels found in dicots. Gymnosperm wood also...

non-living and include, in various groups of plants, vessel members and tracheids. Both of these cell types have thick, lignified secondary cell walls and...