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See also:TREE (0. Eng. treo, treow, cf. See also:Dan. tree, Swed. See also:Odd, tree, trd, See also:timber; allied forms are found in Russ. drevo, Gr. See also:opus, See also:oak, and 36pv, See also:spear, Welsh derw, Irish darog, oak, and Skr. dare, See also:wood)
, the See also:term, applied in a wide sense, to all See also:plants which grow with a permanent single woody See also:stem or See also:trunk of some height, branching out at some distance from the ground
.
There is a somewhat vague dividing See also:line, in popular nomenclature, between " shrubs " and " trees," the former term being usually applied to plants with several stems, of See also:lower height, and bushy in growth
.
The various See also:species to which the name " See also:tree " can be given are treated under their individual titles, e.g. See also:oak, ash, See also:elm, &c.; the articles See also:FIR and See also:PINE treat of two large See also:groups of conifers; See also:general See also:information is provided by the articles PLANTS and See also:GYMNOSPERMS; tree cultivation will be found under FORESTS AND FORESTRY and See also:HORTICULTURE; and the various types of tree whose See also:wood is useful for See also:practical purposes under See also:TIMBER
.
Apart from this general meaning of the word, the See also:chief transferred use is that for a piece of wood used for various specific purposes, as a framework, See also:bar, &c., such as the tree of a See also:saddle, See also:axle-tree, See also:cross-tree, &c
.
TREE-CREEPER, one of the smallest of See also:British birds, and, regard being had to its requirements, one very generally distributed
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It is the Certhia familiaris of See also:ornithology, and is remark-able for the stiffened shafts of its See also:long and pointed tail-feathers, aided by which, and by its comparatively large feet, it climbs the trunks or branches of trees, invariably proceeding upwards or outwards and generally in a See also:spiral direction, as it seeks the small See also:insects that are hidden in the bark and See also:form its chief See also:food
.
When in the course of its See also:search it nears the end of a See also:branch or the See also:top of a trunk, it flits to another, always alighting lower down than the See also:place it has See also:left, and so continues its See also:work
.
Inconspicuous in See also:colour—for its upper plumage is mostly of various shades of See also:
Allied to the tree-creeper, but without its lengthened and stiff tail-feathers, is the genus Tichodroma, the single member of which is the See also:wall-creeper (T. muraria) of the See also:Alps and some other mountainous parts of Europe and Asia
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It is occasionally seen in See also:Switzerland, fluttering like a big butterfly against the See also:face of a See also:rock conspicuous
from the See also:scarlet-See also:crimson of its wing-coverts and its white spotted primaries
.
Its See also:bright See also:hue is hardly visible when the See also:bird is at See also:rest, and it then presentsadingy See also:appearance of See also:grey and See also:black
.
It is a species of wide range, extending from See also:Spain to See also:China; and, though but seldom leaving its cliffs, it has wandered even so far as See also:England
.
Merrett (Pinax, p
.
177) in 1667 included it as a British bird, and the See also:correspondence between Marsham and See also: (A . N.) TREE-See also:FERN . In old and well-grown specimens of some of the See also:familiar ferns of temperate climates the wide-spreading See also:crown of fronds may be observed to rise at a distance often of a See also:good many inches above the ground, and from a stem of consider-able thickness . The common male fern Lastraea (Filix-mas) affords the commonest instance of this; higher and thicker trunks are, however, occasionally presented by the royal fern (Osmunda regalis), in which a height of 2 ft. may be attained, and this with very considerable apparent thickness, due, however, to the origin and descent of a new series of See also:adventitious roots from the bases of each See also:annual set of fronds . Some tropical members and See also:allies of these genera become more 'distinctly tree-like, e.g . Todea; Pterir also has some sub-arboreal forms . Oleandra is branched and See also:shrub-like, while Angiopteris and Maratlia may also rise to 2 ft. or more . But the tree-ferns proper are practically included within the family Cyatheaceae . This includes seven genera (Cyathea, Alsophila, Hemitelia, Dicksonia, Thyrsopteris, Cibotium and Balantium) and nearly 300 species, of which a few are herbaceous, but the See also:majority arboreal and See also:palm-like, reaching frequently a height of 5o ft. or more, Alsophila excelsa of Norfolk See also:Island having sometimes measured 6o to 8o ft . The fronds are rarely See also:simple or simply pinnate, but usually tripinnate or decompound, and may attain a length of 20 ft.,thus forming a splendid crown of foliage . The stem may occasionally branch into many crowns . The genera are of wide See also:geographical range, mostly within the tropics; but See also:South Australia, New See also:Zealand, and the See also:southern Pacific islands all possess their tree-ferns . In See also:Tasmania Alsophila australis has been found up to the See also:snow-level, and in the humid and mountainous regions of the tropics tree-ferns are also found to range up to a considerable See also:altitude . The fronds may either contribute to the apparent thickness of the stem by leaving more or less of-their bases, which become hardened and persistent, or they may be articulated to the stem and fall off, leaving characteristic scars in spiral series upon the stem . The stem is frequently much increased in apparent thickness by the downgrowth of aerial roots, forming a black coating several inches or even a See also:foot in thickness, tut its essential structure differs little in principle from that familiar in the rhizome of the common bracken (Pteris) . To the See also:ring or rather netted See also:cylinder of fibrovascular bundles characteristic of all fernstems scattered See also:internal as well as See also:external bundles arising from these are superadded and in a tree-fern the See also:outer bundles give off branches to the descending roots from the region where they pass into the leaves . Tree-ferns are cultivated for their beauty alone; a few, however, are of some economic applications, chiefly as See also:sources of See also:starch . Thus the beautiful Alsophila excelsa of Norfolk Island is said to be threatened with extinction for the See also:sake of its See also:sago-like See also:pith, which is greedily eaten by hogs; Cyathea medullaris also furnishes a See also:kind of sago to the natives of New Zealand, See also:Queensland and the Pacific islands . A Javanese species of Dicksonia (D. chrysotricha) furnishes silky hairs, which have been imported as a styptic, and the long silky or rather woolly hairs, so abundant on the stem and frond-leaves in the various species of Cibotium have not only been put to a similar use, but in the See also:Sandwich Islands furnish See also:wool for stuffing mattresses and cushions, which was formerly an See also:article of export . The " Tartarian See also:lamb," or Agnus scythicus of old travellers' tales in China and Tartary, is simply the woolly stock of Cibotium Barometz, which, when dried and inverted, with all See also:save four of its frond-stalks cut away, has a droll resemblance to a See also:toy See also:sheep . |
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