cork oak

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cork oak,

name for an evergreen species of the oak genus (Quercus) of the family Fagaceae (beechbeech,
common name for the Fagaceae, a family of trees and shrubs mainly of temperate and subtropical regions in the Northern Hemisphere. The principal genera—Castanea (chestnut and chinquapin), Fagus (beech), and Quercus
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 family). The cork oak (Q. suber) is native to the Mediterranean region, where most of the world's commercial supply of corkcork,
protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem, bark).
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 is obtained. It is cultivated elsewhere as an ornamental and has been introduced into warmer regions of the United States because of its economic value. The bark of the tree is stripped off (about every 10 years) and then processed for shipment as commercial cork. There is a cork layer in all trees but it is not as extensive or valuable as in the cork oak. Cork oak is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Magnoliopsida, order Fagales, family Fagaceae.

Cork Oak

 

two (or three) species of evergreen trees of the genus Quercus, whose trunk and thick branches become covered with corky bark by the third to fifth year of life. The cork may be removed when the tree is 15 to 20 years old. It is removed once every ten years until the tree is 200 years old. The leaves have dentate or entire margins and are gray and hairy below. The trunk reaches a height of 20 m and a diameter of about 1 m.

Quercus suber grows in the coastal region of the western Mediterranean at elevations to 400–500 m. A closely related species is Q. occidentalis, which is native to the coastal region of Portugal and is distinguished by its thin and pubescent leaves. Both species of cork oak are cultivated. In the USSR they are raised in the southern Crimea and in the Caucasus. A third species, Q. crenata (formerly Q. pseudosuber), grows in southern Europe. Apparently a hybrid of Q. cerris and Q. suber, it has a poorly developed cork layer. The species is grown as an ornamental.

REFERENCES

Pravdin, L. F. Probkovyi dub i ego razvedenie v SSSR. Moscow-Leningrad, 1949.
Derev’ia i kustarniki SSSR, vol. 2. Moscow-Leningrad, 1951.
References in periodicals archive ?
The choice of cork oak as phorophyte takes into account the importance of this species not only in the area being investigated, but in the greater (surrounding) area [63].
These properties are due to the reaction of cellulose with suberin (the polymeric ester of phellonic acid and suberinic acids, among others), and are not restricted to the bark of the cork oak (Quercus suber), although no other plant structures shows them so clearly.
Below that depth, soil pH was significantly lower and exchangeable Al greater under the cork oak stand than at the other 2 sites.
Cork oak (Quercus suber) forests are listed in the European Union s Habitats Directive (Council Directive 92/43/EEC) as an important habitat for conservation.
Cork oaks, through their unique ability to thrive in sandy and low-nutrient soils, allow for the crucial fixation of organic matter and water-retention capabilities.
Until recently, cork oaks on Sardinia grew wherever the acorn fell.
A classy field of bitches goes to traps for the final of the Pat Hennerty Sales Cork Oaks, where James Roche's Lurriga Gold was the star semi-final performer.
The kennel also qualified three runners for the last 24 for the Hennerty Sales Cork Oaks including favourite Rockburst Mills.
ly, y, rs y econd aybe ks, erick d urne and rting n a brilliant She was second to College Maybe in the Cork Oaks, then won the Limerick Oaks, moved straight on to Shelbourne won the Sporting Press Irish Oaks in 28.
She reached the Cork Oaks semis and won an Irish St Leger first round heat in 30.
The final of the McCarthy Insurance Group Cork Oaks is the most valuable race on the card and the EUR6,000 prize can be claimed by the Paul Hennessytrained Priceless Spark.
However, it is anticipated that they will be in Glasgow on Friday night before then travelling on to Cork on Saturday for the final of the McCarthy Insurance Cork Oaks, in which their Priceless Spark is the likely favourite.