The Yosemite Part 4

In the main river canyon below the Vernal Fall and on the shady south side of the Valley there are a few groves of the silver fir (Abies concolor), and superb forests of the magnificent species round the rim of the Valley.

On the tops of the domes is found the st.u.r.dy, storm-enduring red cedar (Juniperus occidentalis). It never makes anything like a forest here, but stands out separate and independent in the wind, clinging by slight joints to the rock, with scarce a handful of soil in sight of it, seeming to depend chiefly on snow and air for nourishment, and yet it has maintained tough health on this diet for two thousand years or more.

The largest hereabouts are from five to six feet in diameter and fifty feet in height.

The princ.i.p.al river-side trees are poplar, alder, willow, broad-leaved maple, and Nuttall's flowering dogwood. The poplar (Populus trichocarpa), often called balm-of-Gilead from the gum on its buds, is a tall tree, towering above its companions and gracefully embowering the banks of the river. Its abundant foliage turns bright yellow in the fall, and the Indian-summer suns.h.i.+ne sifts through it in delightful tones over the slow-gliding waters when they are at their lowest ebb.

Some of the involucres of the flowering dogwood measure six to eight inches in diameter, and the whole tree when in flower looks as if covered with snow. In the spring when the streams are in flood it is the whitest of trees. In Indian summer the leaves become bright crimson, making a still grander show than the flowers.

The broad-leaved maple and mountain maple are found mostly in the cool canyons at the head of the Valley, spreading their branches in beautiful arches over the foaming streams.

Scattered here and there are a few other trees, mostly small--the mountain mahogany, cherry, chestnut-oak, and laurel. The California nutmeg (Torreya californica), a handsome evergreen belonging to the yew family, forms small groves near the cascades a mile or two below the foot of the Valley.

Chapter 6

The Forest Trees in General

For the use of the ever-increasing number of Yosemite visitors who make extensive excursions into the mountains beyond the Valley, a sketch of the forest trees in general will probably be found useful. The different species are arranged in zones and sections, which brings the forest as a whole within the comprehension of every observer. These species are always found as controlled by the climates of different elevations, by soil and by the comparative strength of each species in taking and holding possession of the ground; and so appreciable are these relations the traveler need never be at a loss in determining within a few hundred feet his elevation above sea level by the trees alone; for, notwithstanding some of the species range upward for several thousand feet and all pa.s.s one another more or less, yet even those species possessing the greatest vertical range are available in measuring the elevation; inasmuch as they take on new forms corresponding with variations in alt.i.tude. Entering the lower fringe of the forest composed of Douglas oaks and Sabine pines, the trees grow so far apart that not one-twentieth of the surface of the ground is in shade at noon. After advancing fifteen or twenty miles towards Yosemite and making an ascent of from two to three thousand feet you reach the lower margin of the main pine belt, composed of great sugar pine, yellow pine, incense cedar and sequoia. Next you come to the magnificent silver-fir belt and lastly to the upper pine belt, which sweep up to the feet of the summit peaks in a dwarfed fringe, to a height of from ten to twelve thousand feet.

That this general order of distribution depends on climate as affected by height above the sea, is seen at once, but there are other harmonies that become manifest only after observation and study. One of the most interesting of these is the arrangement of the forest in long curving bands, braided together into lace-like patterns in some places and out-spread in charming variety. The key to these striking arrangements is the system of ancient glaciers; where they flowed the trees followed, tracing their courses along the sides of canyons, over ridges, and high plateaus. The cedar of Lebanon, said Sir Joseph Hooker, occurs upon one of the moraines of an ancient glacier. All the forests of the Sierra are growing upon moraines, but moraines vanish like the glaciers that make them. Every storm that falls upon them wastes them, carrying away their decaying, disintegrating material into new formations, until they are no longer recognizable without tracing their transitional forms down the Range from those still in process of formation in some places through those that are more and more ancient and more obscured by vegetation and all kinds of post-glacial weathering. It appears, therefore, that the Sierra forests indicate the extent and positions of ancient moraines as well as they do belts of climate.

One will have no difficulty in knowing the Nut Pine (Pinus Sabiniana), for it is the first conifer met in ascending the Range from the west, springing up here and there among Douglas oaks and thickets of ceanothus and manzanita; its extreme upper limit being about 4000 feet above the sea, its lower about from 500 to 800 feet. It is remarkable for its loose, airy, wide-branching habit and thin gray foliage. Full-grown specimens are from forty to fifty feet in height and from two to three feet in diameter. The trunk usually divides into three or four main branches about fifteen or twenty feet from the ground that, after bearing away from one another, shoot straight up and form separate summits. Their slender, grayish needles are from eight to twelve inches long, and inclined to droop, contrasting with the rigid, dark-colored trunk and branches. No other tree of my acquaintance so substantial in its body has foliage so thin and pervious to the light. The cones are from five to eight inches long and about as large in thickness; rich chocolate-brown in color and protected by strong, down-curving nooks which terminate the scales. Nevertheless the little Douglas Squirrel can open them. Indians climb the trees like bears and beat off the cones or recklessly cut off the more fruitful branches with hatchets, while the squaws gather and roast them until the scales open sufficiently to allow the hard-sh.e.l.l seeds to be beaten out. The curious little Pinus attenuata is found at an elevation of from 1500 to 3000 feet, growing in close groves and belts. It is exceedingly slender and graceful, although trees that chance to stand alone send out very long, curved branches, making a striking contrast to the ordinary grove form. The foliage is of the same peculiar gray-green color as that of the nut pine, and is worn about as loosely, so that the body of the tree is scarcely obscured by it. At the age of seven or eight years it begins to bear cones in whorls on the main axis, and as they never fall off, the trunk is soon picturesquely dotted with them. Branches also soon become fruitful. The average size of the tree is about thirty or forty feet in height and twelve to fourteen inches in diameter. The cones are about four inches long and covered with a sort of varnish and gum, rendering them impervious to moisture.

No observer can fail to notice the admirable adaptation of this curious pine to the fire-swept regions where alone it is found. After a running fire has scorched and killed it the cones open and the ground beneath it is then sown broadcast with all the seeds ripened during its whole life.

Then up spring a crowd of bright, hopeful seedlings, giving beauty for ashes in lavish abundance.

The Sugar Pine, King Of Pine Trees

Of all the world's eighty or ninety species of pine trees, the Sugar Pine (Pinus Lambertiana) is king, surpa.s.sing all others, not merely in size but in lordly beauty and majesty. In the Yosemite region it grows at an elevation of from 3000 to 7000 feet above the sea and attains most perfect development at a height of about 5000 feet. The largest specimens are commonly about 220 feet high and from six to eight feet in diameter four feet from the ground, though some grand old patriarch may be met here and there that has enjoyed six or eight centuries of storms and attained a thickness of ten or even twelve feet, still sweet and fresh in every fiber. The trunk is a remarkably smooth, round, delicately-tapered shaft, straight and regular as if turned in a lathe, mostly without limbs, purplish brown in color and usually enlivened with tufts of a yellow lichen. Toward the head of this magnificent column long branches sweep gracefully outward and downward, sometimes forming a palm-like crown, but far more impressive than any palm crown I ever beheld. The needles are about three inches long in fascicles of five, and arranged in rather close ta.s.sels at the ends of slender branchlets that clothe the long outsweeping limbs. How well they sing in the wind, and how strikingly harmonious an effect is made by the long cylindrical cones, depending loosely from the ends of the long branches! The cones are about fifteen to eighteen inches long, and three in diameter; green, shaded with dark purple on their sunward sides. They are ripe in September and October of the second year from the flower. Then the flat, thin scales open and the seeds take wing, but the empty cones become still more beautiful and effective as decorations, for their diameter is nearly doubled by the spreading of the scales, and their color changes to yellowish brown while they remain, swinging on the tree all the following winter and summer, and continue effectively beautiful even on the ground many years after they fall. The wood is deliciously fragrant, fine in grain and texture and creamy yellow, as if formed of condensed sunbeams. The sugar from which the common name is derived is, I think, the best of sweets. It exudes from the heart-wood where wounds have been made by forest fires or the ax, and forms irregular, crisp, candy-like kernels of considerable size, something like cl.u.s.ters of resin beads.

When fresh it is white, but because most of the wounds on which it is found have been made by fire the sap is stained and the hardened sugar becomes brown. Indians are fond of it, but on account of its laxative properties only small quant.i.ties may be eaten. No tree lover will ever forget his first meeting with the sugar pine. In most pine trees there is the sameness of expression which to most people is apt to become monotonous, for the typical spiral form of conifers, however beautiful, affords little scope for appreciable individual character. The sugar pine is as free from conventionalities as the most picturesque oaks. No two are alike, and though they toss out their immense arms in what might seem extravagant gestures they never lose their expression of serene majesty. They are the priests of pines and seem ever to be addressing the surrounding forest. The yellow pine is found growing with them on warm hillsides, and the silver fir on cool northern slopes but, n.o.ble as these are, the sugar pine is easily king, and spreads his arms above them in blessing while they rock and wave in sign of recognition. The main branches are sometimes forty feet long, yet persistently simple, seldom dividing at all, excepting near the end; but anything like a bare cable appearance is prevented by the small, ta.s.seled branchlets that extend all around them; and when these superb limbs sweep out symmetrically on all sides, a crown sixty or seventy feet wide is formed, which, gracefully poised on the summit of the n.o.ble shaft, is a glorious object. Commonly, however, there is a preponderance of limbs toward the east, away from the direction of the prevailing winds.

Although so unconventional when full-grown, the sugar pine is a remarkably proper tree in youth--a strict follower of coniferous fas.h.i.+ons--slim, erect, with leafy branches kept exactly in place, each tapering in outline and terminating in a spiry point. The successive forms between the cautious neatness of youth and the bold freedom of maturity offer a delightful study. At the age of fifty or sixty years, the shy, fas.h.i.+onable form begins to be broken up. Specialized branches push out and bend with the great cones, giving individual character, that becomes more marked from year to year. Its most constant companion is the yellow pine. The Douglas spruce, libocedrus, sequoia, and the silver fir are also more or less a.s.sociated with it; but on many deep-soiled mountain-sides, at an elevation of about 5000 feet above the sea, it forms the bulk of the forest, filling every swell and hollow and down-plunging ravine. The majestic crowns, approaching each other in bold curves, make a glorious canopy through which the tempered sunbeams pour, silvering the needles, and gilding the ma.s.sive boles and the flowery, park-like ground into a scene of enchantment. On the most sunny slopes the white-flowered, fragrant chamaebatia is spread like a carpet, brightened during early summer with the crimson sarcodes, the wild rose, and innumerable violets and gilias. Not even in the shadiest nooks will you find any rank, untidy weeds or unwholesome darkness. In the north sides of ridges the boles are more slender, and the ground is mostly occupied by an underbrush of hazel, ceanothus, and flowering dogwood, but not so densely as to prevent the traveler from sauntering where he will; while the crowning branches are never impenetrable to the rays of the sun, and never so interblended as to lose their individuality.

The Yellow Or Silver Pine

The Silver Pine (Pinus ponderosa), or Yellow Pine, as it is commonly called, ranks second among the pines of the Sierra as a lumber tree, and almost rivals the sugar pine in stature and n.o.bleness of port. Because of its superior powers of enduring variations of climate and soil, it has a more extensive range than any other conifer growing on the Sierra.

On the western slope it is first met at an elevation of about 2000 feet, and extends nearly to the upper limit of the timber-line. Thence, crossing the range by the lowest pa.s.ses, it descends to the eastern base, and pushes out for a considerable distance into the hot, volcanic plains, growing bravely upon well-watered moraines, gravelly lake basins, climbing old volcanoes and dropping ripe cones among ashes and cinders.

The average size of full-grown trees on the western slope where it is a.s.sociated with the sugar pine, is a little less than 200 feet in height and from five to six feet in diameter, though specimens considerably larger may easily be found. Where there is plenty of free suns.h.i.+ne and other conditions are favorable, it presents a striking contrast in form to the sugar pine, being a symmetrical spire, formed of a straight round trunk, clad with innumerable branches that are divided over and over again. Unlike the Yosemite form about one-half of the trunk is commonly branchless, but where it grows at all close three-fourths or more is naked, presenting then a more slender and elegant shaft than any other tree in the woods. The bark is mostly arranged in ma.s.sive plates, some of them measuring four or five feet in length by eighteen inches in width, with a thickness of three or four inches, forming a quite marked and distinguis.h.i.+ng feature. The needles are of a fine, warm, yellow-green color, six to eight inches long, firm and elastic, and crowded in handsome, radiant ta.s.sels on the upturning ends of the branches. The cones are about three or four inches long, and two and a half wide, growing in close, sessile cl.u.s.ters among the leaves.

The species attains its n.o.blest form in filled-up lake basins, especially in those of the older yosemites, and as we have seen, so prominent a part does it form of their groves that it may well be called the Yosemite Pine.

The Jeffrey variety attains its finest development in the northern portion of the Range, in the wide basins of the McCloud and Pitt Rivers, where it forms magnificent forests scarcely invaded by any other tree.

It differs from the ordinary form in size, being only about half as tall, in its redder and more closely-furrowed bark grayish-green foliage, less divided branches, and much larger cones; but intermediate forms come in which make a clear separation impossible, although some botanists regard it as a distinct species. It is this variety of ponderosa that climbs storm-swept ridges alone, and wanders out among the volcanoes of the Great Basin. Whether exposed to extremes of heat or cold, it is dwarfed like many other trees, and becomes all knots and angles, wholly unlike the majestic forms we have been sketching. Old specimens, bearing cones about as big as pineapples, may sometimes be found clinging to rifted rocks at an elevation of 7000 or 8000 feet, whose highest branches scarce reach above one's shoulders.

I have often feasted on the beauty of these n.o.ble trees when they were towering in all their winter grandeur, laden with snow--one ma.s.s of bloom; in summer, too, when the brown, staminate cl.u.s.ters hang thick among the s.h.i.+mmering needles, and the big purple burrs are ripening in the mellow light; but it is during cloudless wind-storms that these colossal pines are most impressively beautiful. Then they bow like willows, their leaves streaming forward all in one direction, and, when the sun s.h.i.+nes upon them at the required angle, entire groves glow as if every leaf were burnished silver. The fall of tropic light on the crown of a palm is a truly glorious spectacle, the fervid sun-flood breaking upon the glossy leaves in long lance-rays, like mountain water among boulders at the foot of an enthusiastic cataract. But to me there is something more impressive in the fall of light upon these n.o.ble, silver pine pillars: it is beaten to the finest dust and shed off in myriads of minute sparkles that seem to radiate from the very heart of the tree as if like rain, falling upon fertile soil, it had been absorbed to reappear in flowers of light. This species also gives forth the finest wind music. After listening to it in all kinds of winds, night and day, season after season, I think I could approximate to my position on the mountain by this pine music alone. If you would catch the tone of separate needles climb a tree in breezy weather. Every needle is carefully tempered and gives forth no uncertain sound each standing out with no interference excepting during head gales; then you may detect the click of one needle upon another, readily distinguishable from the free wind-like hum.

When a sugar pine and one of this species equal in size are observed together, the latter is seen to be more simple in manners, more lively and graceful, and its beauty is of a kind more easily appreciated; on the other hand it is less dignified and original in demeanor. The yellow pine seems ever eager to shoot aloft, higher and higher. Even while it is drowsing in autumn sun-gold you may still detect a skyward aspiration, but the sugar pine seems too unconsciously n.o.ble and too complete in every way to leave room for even a heavenward care.

The Douglas Spruce

The Douglas Spruce (Pseudotsuga Douglasii) is one of the largest and longest-lived of the giants that flourish throughout the main pine belt, often attaining a height of nearly 200 feet, and a diameter of six or seven feet. Where the growth is not too close, the stout, spreading branches, covering more than half of the trunk, are hung with innumerable slender, drooping sprays, handsomely feathered with the short leaves which radiate at right angles all around them. This vigorous tree is ever beautiful, welcoming the mountain winds and the snow as well as the mellow summer light; and it maintains its youthful freshness undiminished from century to century through a thousand storms. It makes its finest appearance during the months of June and July, when the brown buds at the ends of the sprays swell and open, revealing the young leaves, which at first are bright yellow, making the tree appear as if covered with gay blossoms; while the pendulous bracted cones, three or four inches long, with their sh.e.l.l-like scales, are a constant adornment.

The young trees usually are a.s.sembled in family groups, each sapling exquisitely symmetrical. The primary branches are whorled regularly around the axis, generally in fives, while each is draped with long, feathery sprays that descend in lines as free and as finely drawn as those of falling water.

In Oregon and Was.h.i.+ngton it forms immense forests, growing tall and mast-like to a height of 300 feet, and is greatly prized as a lumber tree. Here it is scattered among other trees, or forms small groves, seldom ascending higher than 5500 feet, and never making what would be called a forest. It is not particular in its choice of soil: wet or dry, smooth or rocky, it makes out to live well on them all. Two of the largest specimens, as we have seen, are in Yosemite; one of these, more than eight feet in diameter, is growing on a moraine; the other, nearly as large, on angular blocks of granite. No other tree in the Sierra seems so much at home on earthquake taluses and many of these huge boulder-slopes are almost exclusively occupied by it.

The Incense Cedar

Incense Cedar (Libocedrus decurrens), already noticed among the Yosemite trees, is quite generally distributed throughout the pine belt without exclusively occupying any considerable area, or even making extensive groves. On the warmer mountain slopes it ascends to about 5000 feet, and reaches the climate most congenial to it at a height of about 4000 feet, growing vigorously at this elevation in all kinds of soil and, in particular, it is capable of enduring more moisture about its roots than any of its companions excepting only the sequoia.

Casting your eye over the general forest from some ridge-top you can identify it by the color alone of its spiry summits, a warm yellow-green. In its youth up to the age of seventy or eighty years, none of its companions forms so strictly tapered a cone from top to bottom. As it becomes older it oftentimes grows strikingly irregular and picturesque. Large branches push out at right angles to the trunk, forming stubborn elbows and shoot up parallel with the axis. Very old trees are usually dead at the top. The flat fragrant plumes are exceedingly beautiful: no waving fern-frond is finer in form and texture. In its prime the whole tree is thatched with them, but if you would see the libocedrus in all its glory you must go to the woods in midwinter when it is laden with myriads of yellow flowers about the size of wheat grains, forming a n.o.ble ill.u.s.tration of Nature's immortal virility and vigor. The mature cones, about three-fourths of an inch long, born on the ends of the plumy branchlets, serve to enrich still more the surpa.s.sing beauty of this winter-blooming tree-goldenrod.

The Silver Firs

We come now to the most regularly planted and most clearly defined of the main forest belts, composed almost exclusively of two Silver Firs--Abies concolor and Abies magnifica--extending with but little interruption 450 miles at an elevation of from 5000 to 9000 feet above the sea. In its youth A. concolor is a charmingly symmetrical tree with its flat plumy branches arranged in regular whorls around the whitish-gray axis which terminates in a stout, hopeful shoot, pointing straight to the zenith, like an admonis.h.i.+ng finger. The leaves are arranged in two horizontal rows along branchlets that commonly are less than eight years old, forming handsome plumes, pinnated like the fronds of ferns. The cones are grayish-green when ripe, cylindrical, from three to four inches long, and one and a half to two inches wide, and stand upright on the upper horizontal branches. Full-grown trees in favorable situations are usually about 200 feet high and five or six feet in diameter. As old age creeps on, the rough bark becomes rougher and grayer, the branches lose their exact regularity of form, many that are snow-bent are broken off and the axis often becomes double or otherwise irregular from accidents to the terminal bud or shoot. Nevertheless, throughout all the vicissitudes of its three or four centuries of life, come what may, the n.o.ble grandeur of this species, however obscured, is never lost.

The magnificent Silver Fir, or California Red Fir (Abies magnifica) is the most symmetrical of all the Sierra giants, far surpa.s.sing its companion species in this respect and easily distinguished from it by the purplish-red bark, which is also more closely furrowed than that of the white, and by its larger cones, its more regularly whorled and fronded branches, and its shorter leaves, which grow all around the branches and point upward instead of being arranged in two horizontal rows. The branches are mostly whorled in fives, and stand out from the straight, red-purple bole in level, or in old trees in drooping collars, every branch regularly pinnated like fern-fronds, making broad plumes, singularly rich and sumptuous-looking. The flowers are in their prime about the middle of June; the male red, growing on the underside of the branches in crowded profusion, giving a very rich color to all the trees; the female greenish-yellow, tinged with pink, standing erect on the upper side of the topmost branches, while the tufts of young leaves, about as brightly colored as those of the Douglas spruce, make another grand show. The cones mature in a single season from the flowers. When mature they are about six to eight inches long, three or four in diameter, covered with a fine gray down and streaked and beaded with transparent balsam, very rich and precious-looking, and stand erect like casks on the topmost branches. The inside of the cone is, if possible, still more beautiful. The scales and bracts are tinged with red and the seed-wings are purple with bright iridescence. Both of the silver firs live between two and three centuries when the conditions about them are at all favorable. Some venerable patriarch may be seen heavily storm-marked, towering in severe majesty above the rising generation, with a protecting grove of hopeful saplings pressing close around his feet, each dressed with such loving care that not a leaf seems wanting.

Other groups are made up of trees near the prime of life, nicely arranged as if Nature had culled them with discrimination from all the rest of the woods. It is from this tree, called Red Fir by the lumbermen, that mountaineers cut boughs to sleep on when they are so fortunate as to be within its limit. Two or three rows of the sumptuous plushy-fronded branches, overlapping along the middle, and a crescent of smaller plumes mixed to one's taste with ferns and flowers for a pillow, form the very best bed imaginable. The essence of the pressed leaves seems to fill every pore of one's body. Falling water makes a soothing hush, while the s.p.a.ces between the grand spires afford n.o.ble openings through which to gaze dreamily into the starry sky. The fir woods are fine sauntering-grounds at almost any time of the year, but finest in autumn when the n.o.ble trees are hushed in the hazy light and drip with balsam; and the flying, whirling seeds, escaping from the ripe cones, mottle the air like flocks of b.u.t.terflies. Even in the richest part of these unrivaled forests where so many n.o.ble trees challenge admiration we linger fondly among the colossal firs and extol their beauty again and again, as if no other tree in the world could henceforth claim our love. It is in these woods the great granite domes arise that are so striking and characteristic a feature of the Sierra. Here, too, we find the best of the garden-meadows full of lilies. A dry spot a little way back from the margin of a silver fir lily-garden makes a glorious camp-ground, especially where the slope is toward the east with a view of the distant peaks along the summit of the Range. The tall lilies are brought forward most impressively like visitors by the light of your camp-fire and the nearest of the trees with their whorled branches tower above you like larger lilies and the sky seen through the garden-opening seems one vast meadow of white lily stars.

The Two-Leaved Pine

The Two-Leaved Pine (Pinus contorta, var. Murrayana), above the Silver Fir zone, forms the bulk of the alpine forests up to a height of from 8000 to 9500 feet above the sea, growing in beautiful order on moraines scarcely changed as yet by post-glacial weathering. Compared with the giants of the lower regions this is a small tree, seldom exceeding a height of eighty or ninety feet. The largest I ever measured was ninety feet high and a little over six feet in diameter. The average height of mature trees throughout the entire belt is probably not far from fifty or sixty feet with a diameter of two feet. It is a well-proportioned, rather handsome tree with grayish-brown bark and crooked, much-divided branches which cover the greater part of the trunk, but not so densely as to prevent it being seen. The lower limbs, like those of most other conifers that grow in snowy regions, curve downward, gradually take a horizontal position about half-way up the trunk, then aspire more and more toward the summit. The short, rigid needles in fascicles of two are arranged in comparatively long cylindrical ta.s.sels at the ends of the tough up-curving branches. The cones are about two inches long, growing in cl.u.s.ters among the needles without any striking effect except while very young, when the flowers are of a vivid crimson color and the whole tree appears to be dotted with brilliant flowers. The staminate flowers are still more showy on account of their great abundance, often giving a reddish-yellow tinge to the whole ma.s.s of foliage and filling the air with pollen. No other pine on the Range is so regularly planted as this one, covering moraines that extend along the sides of the high rocky valleys for miles without interruption. The thin bark is streaked and sprinkled with resin as though it had been showered upon the forest like rain.

Therefore this tree more than any other is subject to destruction by fire. During strong winds extensive forests are destroyed, the flames leaping from tree to tree in continuous belts that go surging and racing onward above the bending wood like prairie-gra.s.s fires. During the calm season of Indian summer the fire creeps quietly along the ground, feeding on the needles and cones; arriving at the foot of a tree, the resiny bark is ignited and the heated air ascends in a swift current, increasing in velocity and dragging the flames upward. Then the leaves catch forming an immense column of fire, beautifully spired on the edges and tinted a rose-purple hue. It rushes aloft thirty or forty feet above the top of the tree, forming a grand spectacle, especially at night. It lasts, however, only a few seconds, vanis.h.i.+ng with magical rapidity, to be succeeded by others along the fire-line at irregular intervals, tree after tree, upflas.h.i.+ng and darting, leaving the trunks and branches scarcely scarred. The heat, however, is sufficient to kill the tree and in a few years the bark shrivels and falls off. Forests miles in extent are thus killed and left standing, with the branches on, but peeled and rigid, appearing gray in the distance like misty clouds. Later the branches drop off, leaving a forest of bleached spars. At length the roots decay and the forlorn gray trunks are blown down during some storm and piled one upon another, enc.u.mbering the ground until, dry and seasoned, they are consumed by another fire and leave the ground ready for a fresh crop.

In sheltered lake-hollows, on beds of alluvium, this pine varies so far from the common form that frequently it could be taken for a distinct species, growing in damp sods like gra.s.ses from forty to eighty feet high, bending all together to the breeze and whirling in eddying gusts more lively than any other tree in the woods. I frequently found specimens fifty feet high less than five inches in diameter. Being so slender and at the same time clad with leafy boughs, it is often bent and weighed down to the ground when laden with soft snow; thus forming fine ornamental arches, many of them to last until the melting of the snow in the spring.

The Mountain Pine

The Mountain Pine (Pinus monticola) is the n.o.blest tree of the alpine zone--hardy and long-lived towering grandly above its companions and becoming stronger and more imposing just where other species begin to crouch and disappear. At its best it is usually about ninety feet high and five or six feet in diameter, though you may find specimens here and there considerably larger than this. It is as ma.s.sive and suggestive of enduring strength as an oak. About two-thirds of the trunk is commonly free of limbs, but close, fringy tufts of spray occur nearly all the way down to the ground. On trees that occupy exposed situations near its upper limit the bark is deep reddish-brown and rather deeply furrowed, the main furrows running nearly parallel to each other and connected on the old trees by conspicuous cross-furrows. The cones are from four to eight inches long, smooth, slender, cylindrical and somewhat curved.

They grow in cl.u.s.ters of from three to six or seven and become pendulous as they increase in weight. This species is nearly related to the sugar pine and, though not half so tall, it suggests its n.o.ble relative in the way that it extends its long branches in general habit. It is first met on the upper margin of the silver fir zone, singly, in what appears as chance situations without making much impression on the general forest.

Continuing up through the forests of the two-leaved pine it begins to show its distinguis.h.i.+ng characteristic in the most marked way at an elevation of about 10,000 feet extending its tough, rather slender arms in the frosty air, welcoming the storms and feeding on them and reaching sometimes to the grand old age of 1000 years.