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Quercus petraea, commonly known as the sessile oak, [3] Cornish oak, [4] Irish oak or durmast oak, [5] is a species of oak tree native to most of Europe and into Anatolia and Iran. The sessile oak is the national tree of Ireland , [ 6 ] and an unofficial emblem in Wales [ 7 ] and Cornwall .
Other tree species offered in the sale include: Long Regal Prince Oak, Scarlet Curls Willow, Lindsey's Skyward Bald Cypress, and Cascade Falls Weeping Bald Cypress.
The common spangle gall on the underside of leaves and the currant gall on the male catkins or occasionally the leaves, develop as chemically induced distortions on pedunculate oak (Quercus robur), or sessile oak (Quercus petraea) trees, caused by the cynipid wasp [1] Neuroterus quercusbaccarum which has both agamic and bisexual generations.
Currently, there are two species of oak – the pedunculate oak and the sessile oak. The pedunculate oak has fruits on long stalks, while the sessile oak has very short stalks, giving the impression of no stalks. The leaves of the pedunculate oak have a lobed base, whereas those of the sessile oak have a wedge-shaped base.
The tree has a girth of 14.02 metres (46.0 ft) measured at 1.5 metres (4 ft 11 in) off the ground, making it the UK's largest and widest tree since the collapse of the Newland Oak in Gloucestershire, [1] [2] [3] surpassing trees such as the Bowthorpe Oak in Lincolnshire and the three large sweet chestnut trees at Canford School, Dorset. [3]
The principal trees are sessile oak (Quercus petraea) (73%), whose ancient name in French, tronce, gave its name to the district. Other dominant species are beech (Fagus sylvatica) (9%) and pedunculate oak (8%), with hornbeam and Scots pine planted in the poorer soils. Trees are harvested on a rotation averaging 250 years.
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