Part 25 (2/2)
A mature tree may be one hundred feet high and three or four feet in diameter. It has a round or pyramidal attractive crown composed of many slender branches and twigs. The foliage is distinctively grouped at the ends of the twigs in star-like cl.u.s.ters. The leaves are four or six inches long, with wedge-shaped or rounded bases, and are deep green and s.h.i.+ny on the upper side, but lighter below. The acorns are short, stubby, and rounded, covered one-third of the way with thin shallow cups.
s.h.i.+ngle oak grows rapidly, and it is often sold by nurseries which deal in ornamental forest trees. It is hardy as far north as Ma.s.sachusetts.
Although it bears great abundance of leaves, they are so arranged that the crown seems open. One may see through the branches of a large s.h.i.+ngle oak, and it suggests an airiness not common with oaks.
Differences of opinion exist concerning the value of s.h.i.+ngle oak for commercial purposes. It belongs in the black oak group, and its wood goes to market as red oak, and apparently is never listed as anything else. It is never named in market reports; shops and factories never report it, and it has been p.r.o.nounced inferior to red oak in strength and seasoning properties. Tests have been made of some of its physical properties, and the results do not indicate that the wood belongs with inferior timbers. Its breaking strength is given at 39 per cent greater than white oak, and its stiffness at 28 per cent greater. However, these values, which are calculated from Sargent's tables, are based on tests of only a few specimens of the wood, and fuller investigation might make revision necessary.
The wood is heavy, hard, and is said to check badly in drying. The pores are large and are arranged in rows; medullary rays are broad and conspicuous. The wood is light brown, tinged with red, the sapwood much lighter. The broad medullary rays, running radially, give the wood its good splitting qualities.
The tree is fairly abundant in different parts of its range, and is cut and manufactured with other oaks and hardwoods. Slack coopers use it for barrels; box makers employ it for crates; chair mills saw dimension stock and s.h.i.+p it to factories to be finished; some goes to furniture factories; some is turned for spindles for grills, and for bal.u.s.ters for stairs; other fills various places as interior finish and molding. But it all goes to market and pa.s.ses through factories under names other than its own.
WATER OAK (_Quercus nigra_) has several names, some of them bestowed with little apparent reason. It is called possum oak and duck oak, but these names are neither descriptive nor definitive. Punk oak is another name. It may refer to a decayed condition of the wood, but this tree is no more affected by decay than others of the same region. In Texas it is sometimes known as spotted oak. It thrives in wet situations though not actually in swamps. It prefers margins of ponds, banks of rivers, and low swales where the ground water is just below the surface, but it is not confined to such situations. It does well, within its range, wherever willow oak flourishes, but willow oak has a wider range. The leaves take on various forms, and they change shape as they increase in size. Some have smooth margins, others are lobed. Some are wedge-shaped, others coffin-shaped. Their typical form, if it may be said of them that they have a typical form, is narrow at the stem end and wide at the other. To this is usually added rudimentary lobes, which are sometimes nearly as well developed as in any other oak. Their typical form is like the leaf of the black jack oak; but they are not half as large, and are thin and delicate, while the black jack's leaf is thick and leathery.
The range of water oak begins in Delaware and follows the Atlantic coastal plain south to central Florida, and through the Gulf States to Texas. It grows as far north as Kentucky and Missouri. It keeps clear of the Appalachian mountain region, and other hilly districts. It is plentiful in some parts of its range, and trunks three feet in diameter and long enough for two or three logs are not unusual, yet large numbers of water oaks may be seen in the South which are not fit for sawlogs because they stand in open ground and are limby down to ten feet of the ground. Many have been planted for shade trees in streets and in parks, and are justly admired. They grow rapidly and are extremely graceful.
Their leaves are deciduous, but adhere to the branches most of the year.
South of the belt of severe frost, the old leaves frequently hang until the buds for the new crop are opening. The acorns are bitter, and even the southern pine hog pa.s.ses them by until the pinch of famine edges up his appet.i.te.
Water oak possesses value as a source of lumber, but it belongs with the large cla.s.s of oaks which lose their names and their ident.i.ty when they pa.s.s the threshold of the sawmill. They come out red oak. Only in rare instances is water oak called by its own name in the factory and lumber yard. Wagon makers employ it for bolsters, axles, spokes, tongues, sandboards, hounds, felloes and reaches. Entire dump carts, except the iron, are constructed of this wood. Furniture manufacturers use it as frame material, but seldom as the outside visible parts, though no reason for not doing so is offered. Objection is made to its seasoning qualities, but the same objection applies to most red oaks. A considerable amount of water oak is cut in the South into thick planks for bridge floors. It is strong and hard, and satisfactorily resists decay in that place; though, in common with the black oaks generally, it is liable to decay when exposed to dampness. The wood weighs a little less than white oak, and is not quite as strong or as stiff. It is porous, but the pores are small, except one or two rows in the springwood. The medullary rays are thin and not numerous, but they are conspicuous, and the wood may be successfully quarter-sawed. The lumber has the appearance of red oak, though the reddish color is not so p.r.o.nounced.
BARTRAM OAK (_Quercus heterophylla_). This interesting but commercially unimportant oak was named by Michaux from a single tree found in a field belonging to John Bartram near Philadelphia more than a century ago. A few trees have since been found in widely scattered districts as far south as North Carolina and as far west as Texas. Botanists believe it is a hybrid, one parent being the willow oak (_Quercus ph.e.l.los_) and the other yellow oak (_Quercus velutina_). It is probable that here may be witnessed the origin of a tree species. The leaves seem to be a compromise between the deeply cut foliage of yellow oak and the entire leaf of willow oak.
The new species is so scarce that few people have ever seen it.
[Ill.u.s.tration]
RED GUM
[Ill.u.s.tration: RED GUM]
RED GUM
(_Liquidambar Styraciflua_)
This tree does not belong to the same group as black gum and tupelo, which are in the dogwood family, while red gum is of the witch hazel family. If a tree is to be judged and named by its character, red gum is more ent.i.tled to the name ”gum” than any other tree of this country, because it exudes a yellow resin from wounds in the bark. The botanical name recognizes that fact. Storax is procured from a closely related tree is Asia, and has been known in commerce for many centuries. The other popular names of red gum are sweet gum, liquid-amber gum, gum tree, alligator wood, bilsted, starleaved gum, and satin walnut.
The last name originated in England where it was desirable to avoid the name gum when applied to the wood of this tree. Though botanically it is about as distantly related to walnut as any tree can be, the figure of the wood often suggests walnut. The name sweet gum refers to the pleasant odor of the resin which is sometimes used in France, and probably elsewhere, to perfume gloves. Alligator wood is descriptive of warty excrescences on the bark of some trees, but they are not common to all. Starleaved gum relates to the leaf. It is a lopsided star--a six point star with one point missing.
This tree's range in the United States extends from Connecticut to Texas and as far northwest of the Alleghanies as Missouri and Illinois. It reaches its greatest size in the lower Mississippi valley in rich bottom land which is subject to repeated inundation. It is not, however, as purely a swamp tree as tupelo and cypress. It grows well on land which is never inundated, but it needs plenty of moisture. The largest specimens exceed a height of 120 feet and a diameter of four; but logs from eighteen inches to three feet are the usual sizes. The tree's range extends southward through Mexico into Central America.
The rise of red gum lumber into prominence forms an interesting chapter in the industry. It was formerly considered so difficult to season that few mills cared to deal with it, but that difficulty has been largely overcome. In the past, gum, having no market value, was left standing after logging; or, where the land was cleared for farming, was girdled and allowed to rot, and then felled and burned. Not only were the trees a total loss to the farmer, but, from their great size and the labor required to handle them, they were so serious an obstruction as often to preclude the clearing of valuable land. Now that there is a market for the timber, it is profitable to cut gum with other hardwoods, and land can be cleared more cheaply. This increase in the value of gum timber will be of great benefit to the South in many ways.
Throughout its entire life red gum is intolerant of shade. As a rule seedlings appear only in clearings or in open spots in the forest. It is seldom that an overtopped tree is found, for the gum dies quickly if suppressed, and is consequently nearly always a dominant or intermediate tree. In a hardwood bottom forest, the timber trees are all of nearly the same age over considerable areas, and there is little young growth to be found in the older stands. The reason for this is the intolerance of most of the swamp species.
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