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Each of the trees in this stand is a genetically identical male that has reproduced vegetatively. Although no single tree in this stand is of that age, the stand itself as a single organism has existed that long. [119] Individual trees in the clonal patch have been listed as having ages of 2000 [120] [121] or even to 3000 years old. [122] [123]
Large branches are known as boughs and small branches are known as twigs. [3] The term twig usually refers to a terminus, while bough refers only to branches coming directly from the trunk. Due to a broad range of species of trees, branches and twigs can be found in many different shapes and sizes.
A large tree on the Gulf Park campus of the University of Southern Mississippi, 59 feet (18 m) tall with a trunk diameter of 5.75 feet (1.75 m) and circumference of 19.8 feet (6.0 m). General Grant tree: Giant sequoia (Sequoiadendron giganteum) Kings Canyon National Park, USA The "Nation's Christmas Tree" of the United States. General Sherman tree
Many are also decorative garden trees, notably Korean fir and Fraser's fir, which produce brightly coloured cones even when very young, still only 1–2 m (3 ft 3 in – 6 ft 7 in) tall. Many fir species are grown in botanic gardens and other specialist tree collections in Europe and North America.
The tree reacts to the growth of the fungus by blocking off the xylem tissue carrying sap upwards and the branch above, and eventually the whole tree, is deprived of nourishment and dies. In Britain in the 1990s, 25 million elm trees were killed by this disease.
The King Oak has been heavily pollarded and is a large tree, with a trunk of 8.29 metres (9.07 yd) girth and some of the lower branches extending as far as 27 metres (30 yd). A superstition associated with the tree says that if one of its branches should fall a member of Bury family, long-time owners of the Charleville Estate, will die.
The winged seeds may fly as far as 180 m (590 ft) from the parent tree. Lower branches die readily from being shaded, but trees younger than 100 years retain most of their dead branches. Trunks of mature trees in groves are generally free of branches to a height of 20–50 m (70–160 ft), but solitary trees retain lower branches.
Systems of classification used to define large trees vary considerably, leading to some confusion about Pando's status. Within the United States, the Official Register of Champion Trees defines the largest trees in a species-specific way; in this case, Pando is the largest aspen tree (Populus tremuloides). In forestry, the largest trees are ...