CALIFORNIA TANBARK OAK
(Quercus Densiflora)

Botanists dispute the right of this tree to the name of oak, and some of them refuse to call it an oak. It is admitted that it possesses characters not found in any other oak, but these are important to the botanist only, while laymen have never considered the tree anything but an oak. It has been variously called tanbark oak, chestnut oak, California chestnut oak, live oak, and peach oak. The trunk, branches, and foliage look much like chestnut. The leaf is like the chestnut’s, but it is evergreen. There are three or four crops on the tree at one time, and none fall until they are three or four years old. Young leaves are remarkably woolly, but late in their first summer they get rid of most of the fuzz, and become thick in texture.

Tanbark oaks are of all sizes, from mere shrubs on high mountains in the northern Sierra Nevadas to fine and symmetrical timber in the damp climate of the fog belt between San Francisco and the Oregon line. The average height of mature trees is from seventy to 100 feet, with diameters up to six feet in rare cases, though more trunks are under than over two feet in diameter.

The range of this oak reaches southern Oregon on the north, and runs southward three or four hundred miles along the Sierra Nevada mountains, to Mariposa county, and six hundred miles through the Coast range to Santa Barbara county. The tree is affected by climatic conditions, and where surroundings do not suit, it is small and shrubby, often less than ten feet high. It does best in the redwood belt where fogs from the Pacific ocean keep the air moist and the ground damp. It sometimes associates with Douglas fir, and at other times with California live oak. If it grows in dense side shade it loses its lower branches and develops a long, clean trunk; but in open ground it keeps its limbs until late in life.

This is the most important source of tanbark on the Pacific coast, and up to the present it has been procurable in large quantities. The annual output is nearly 40,000 tons, and it commands a higher price than the bark of any other oak or of hemlock. The absence of other adequate tanning materials on the Pacific coast gives this tree much importance. Its range covers several thousand square miles, and the stand is fairly good on much of it. But on the other hand, the destruction of timber to secure the bark has been excessive. What occurred with chestnut oak and hemlock in the East, is occurring with tanbark oak in the West. Trees are cut and peeled, and are left by thousands to rot in the woods, or to feed fires and make them more destructive. The bark peelers do their principal work in the California redwood region, because there the oak is at its best. Economic conditions make the salvage of the trunks impossible. The bark can be hauled to market, but the wood is unsalable at living prices, after the long haul. It has, therefore, been usually abandoned, and becomes a total loss. It cannot even be sold for fuel, because the country within reach of it is thinly settled, and wood is plentiful on every side.

Large oaks are felled, because the bark can not be stripped from the trunks in any other way, and small trees are not spared. The peelers often do not take the trouble to cut them down, but strip off the bark as high as a man can reach, and leave them standing. A future tree is thus destroyed for the sake of a strip of bark a few feet long. Such trees live a year or two, sometimes several years, before yielding to the inevitable. Usually, as a last expiring effort, they bear an abnormally large crop of acorns. That performance, in the language of the bark peelers, is “the last kick.” A tanbark slashing, when the peelers are ready to abandon it, is a sorry spectacle. The barkless and sun-cracked trunks strew the ground, the tops and limbs are piled in windrows, the small peeled trees stand dying, and the last ricks of bark have been sledded down the tote roads, marking the close of operations in that district. A few months later, when fire runs through, the end of the tanbark oak on that tract is accomplished.

Within recent years commendable efforts have been made to use the wood as well as the bark. One of the first steps in that direction was to overcome the prejudice against the wood. It was long considered to be valueless. That belief was founded on the single fact that this oak is difficult to season. Few woods in this country check as badly as this, when it is left exposed to sun and wind after the bark has been removed. It checks both radially and along the annual rings. The medullary rays are broad and extend much of the distance from the center to the outside. These are natural lines of cleavage when the log begins to season and the internal stresses develop. It must be admitted that the prospect of making anything out of timber of that character is discouraging; but it has been accomplished, and tanbark oak is now a material of considerable value.

The wood has about the strength and stiffness of white oak, while it is four pounds lighter per cubic foot. The structure is similar to that of California live oak, but the pores of tanbark oak are smaller. They run in rows from center to circumference. The medullary rays are broad enough to show well in quarter-sawing, but the wood’s appearance when so worked is not wholly satisfactory. The exposed flat surfaces of the rays show a faint purplish or violet tinge which is considered objectionable. But when the wood is worked plain it is dependable and substantial. It makes good flooring, fairly good furniture, finish, vehicles, and agricultural implements. It is perishable when placed in damp situations, and this detracts somewhat from its value as railway ties; but the wood’s porous nature indicates that it will readily yield to preservative treatment.

Since the value of the wood is coming to be understood it is to be expected that less of it will be destroyed than formerly, and that second growth will be given opportunity to hold the ground when old stands are cut. The tree is a prolific seeder, but not every year, and seedlings come up abundantly in sheltered places. Sprouts rise from stumps and grow to vigorous trees. It would seem, therefore, that the tanbark oak will hold at least part of the ground where nature planted it.

Toumey Oak (Quercus toumeyi). No oak in this country has smaller leaves than this. They are usually less than three-fourths of an inch long and half an inch wide, and they hang on petioles one-sixteenth inch long. The leaves have no lobes or notches. They remain all winter and fall in the spring in time to make room for the new crop. The acorns are nearly as long as the leaves and ripen in June of the first year. Few persons ever see this oak, for its known range is restricted to Mule mountain, in Cochise county, southeastern Arizona. It attains a height of twenty-five or thirty feet, and a diameter of six or eight inches. The trunk is not only small, but is of form so poor that it can never be of value for anything but fuel. It divides near the ground into crooked branches. The heart of the tree is light brown, the thick sapwood is lighter.