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 cortex of Quercus suber is very favorable for growth of lichens [57, 49, 11].
Effects of exogenous ABA on embryo maturation and quantification of endogenous levels of ABA and IAA in Quercus suber somatic embryos.
Effects of three wildfires on water pH and Electrical Conductivity in forests dominated by Quercus suber and Pinus pinaster, located near urban areas, in Cerda, A.
A number of the lichen taxa surveyed at the six stations were found on Quercus suber.
In the present study, we have analysed soils for changes in soil chemical properties under Pinus radiata (radiata pine), under Quercus suber (cork oak), and under adjacent permanent improved pasture.
Este bosque representa la etapa climax de la serie climatofila luso-extremadurense silicicola y calcoade mesomediterranea seca superior-subhumeda de los bosques de Quercus suber con Sanguisorba hybrida (Rivas-Martinez, 1987).
In the study area we identified the climatophilous thermomediterranean series of Asparago aphylli-Querceto suberis sigmetum, Gaditan-Algarvian and Lusitan-Extremadurean, with subhumid to humid and silicicolous forests of Quercus suber.
Asparago albi-Rhamnetum oleoidis [433312] 5330 Matorrales esclerofilos Centaureo -Retametum monospermae 5330 " Dehesas Quercus suber [531023] 6310 Pastizales naturales y semin.
Entre ellas destaca la presencia de calcio como elemento discriminante en el comportamiento de las especies estudiadas; Quercus suber y Arbutus unedo aparecieron siempre en suelos con muy baja presencia de Ca (0,69 a 15,14 cmolc-[kg.
En estas muestras aparecen taxones como Antirrhinum meonanthum, Armeria pubigera, Asparagus aphyllus, Daphne gnidium, Pulicaria odora, Quercus suber o Satureja nepeta, cuya presencia relacionamos con la existencia de veranos mas soleados y termicos que favorecen la incorporacion de flora de optimo mediterraneo, ampliamente difundida a lo largo de los territorios biogeograficos galaico-portugueses, a esta comunidad.