Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 31, 1898
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Behaviour of Individual Trees.

As a help towards the solution of the question at issue, I append a few short notes on the behaviour of some of the most important trees under the ordeal to which they have to submit.

The Kauri.—Naturally the kauri first claims our attention. It is painful to think that this noble and beautiful tree is destined within a comparatively few years to become practically a thing of the past. As noticed in my former paper, the floor of the kauri bush is covered with a thick coating of vegetable humus (pukahu), which is rendered highly inflammable by a mixture of dead leaves, particles of gum, and scales dropped from the resinous bark; so that, even if the trees are not felled for timber, they run a constant risk of being killed by fire. Under very exceptional circumstances a few single specimens, or small clumps isolated in the mixed bush, may manage to survive in some deep and sheltered gully; and these, together with the “rickers,” too small to be worked to advantage, and the seedlings in the “second growth,” will soon be all that is left. After the fire has passed two or three times over the site of a kauri bush the land generally settles down to a short growth of tea-tree scrub.

The Rata.*—-The rata, or at least the northern variety, is also to a great extent doomed to disappear, though generally by a different process. Starting in life as an epiphyte among the branches of some lofty tree, the rata sends down its aerial roots, which on reaching the ground thicken and gradually enlace the trunk of its supporter, often squeezing it to death, at the same time putting out great spreading branches above, and eventually becoming the largest and most conspicuous tree in the forest. Robust and vigorous as it appears, however, it cannot long stand the new conditions. First we miss the grand crown of crimson bloom; next we notice the gradual shrinking of the rounded tufts, of foliage; and soon the spreading limbs are but a giant cluster of stags' horns,

[Footnote] * For an excellent account of the rata, vide Kirk's “Forest Flora of New Zealand,” s.v.

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lichen-coated, and dropping to decay. The great coil of twining roots are almost superficial, and fail to draw their nourishment from the bare and hoof-trodden ground.

Mountain Rata.—For the mountain rata of the South there is a happier prospect. It is a true tree, better rooted than its northern congener, and with its advantages of climate and situation will probably continue one of the most conspicuous features of the alpine scenery.

Puriri.—The puriri, as Mr. T. Kirk has noted, is the only tree which is able to resist the strangling pressure of the rata, and it is one of the few which, in anything approaching an adult stage, will survive the removal of the surrounding bush. It will stand any amount of hacking and cutting about; and even when partly destroyed by fire—so long as the bark is not burned round the root—it will renew its youth by a fresh growth from the trunk and lower branches. Unfortunately, the species is of limited distribution, being confined to the upper half of the northern Island; and, as the timber is in great, request for railway sleepers, fencing-posts, &c., all the best specimens are rapidly disappearing. Moreover, there is not much chance of its renewal, except in places inaccessible to stock, as the seedlings are quickly eaten off. Still, the puriri is a long-lived tree, and probably existing specimens will survive for an indefinite period. An example of its vitality may be seen in the old mission settlement of Waimate, where several beautiful clumps have held their ground against the cattle in enclosed paddocks for at least fifty years. Even after death the puriri is a noble object, as, bleached to a snowy whiteness, it stands with all its branches perfect long after every vestige of the surrounding bush has disappeared, both above and below ground, apparently insensible to decay.

Kahikatea.—The kahikatea, or white-pine, is distributed over the greater part of New Zealand, and is found in greatest abundance in low and swampy situations, where it frequently forms continuous forests of large extent. Specimens of a harder variety are common in the mixed bush on higher ground. Generally easy of access, and affording a useful timber, it is being largely removed for mill purposes. The kahikatea is a delicate, tree, and does not long survive under altered circumstances; in fact, during the last few years immense bushes have disappeared with, marvellous rapidity, their sites being now occupied by cabbage-tree, flax, and raupo swamp, according to the comparative wetness of the situation. In the drier portions the ground is often covered with a close crop of seedlings, many of which attain a considerable height. It is doubtful, however, if they will equal the parent growth.

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Other Pines.—Of the other so-called pines the totara and rimu—both noble trees and of wide distribution—are the most important. They are, however, much sought-after for the excellence of their timber; and it is only a question of time when all the best specimens will be removed in all accessible situations. Fortunately, the seedlings are cattle-resistant, and perfectly hardy; and the totara and rimu, together with the matai, tanekaha, miro, &c., will form an important element of the bush of the future.

Beeches.—The beeches, of which there are several varieties, are chiefly confined to the South Island, where they frequently form continuous bushes of large extent. The timber is used for all purposes, and the best portions have been already cut out. Mr. Kirk has pointed out a property of the beech-forest which, with the exception of the tea-tree, is quite unique in the New Zealand bush—viz., its-power of renewing itself from seed, all that is required for its perfect restoration being the exclusion of cattle (vide “Forest Flora of New Zealand”: Art. Fagus).

Tawa.—The tawa, though unimportant as a timber tree, deserves mention on account of its large size, wide distribution, and handsome appearance. It is common to all parts of the North Island, and formed a few years ago one of the most attractive features of the extensive forests of Taranaki, Hawke's Bay, and Wellington, now mostly destroyed by fire. It is a tall, graceful tree, with a clean trunk and light willow-like foliage. The timber until lately was considered to be of little value except for firewood, on account of its perishable nature, but of late a use has been found for it in the manufacture, of butter-cases, for which it is excellently adapted. The tawa is, unfortunately, one of the first trees to disappear, as the roots stand out above the surface, and are covered with the very thinnest of bark. In many districts where the bush is otherwise in fairly good preservation it has almost entirely perished.

Towai.—The towai is a large, handsome tree, chiefly valued for the tanning properties of its bark. It is distributed all over the colony, and has the distinction of being the only tree above the size of a mere bush which grows in the open fern land, where it quickly springs up from the root after a fire. It is found in great abundance on steep rocky river-banks, and flourishes on high and exposed situations. Although its roots are very superficial, the towai is fairly cattle-resistant, and is destined to figure largely in the bush of the future.

Titoki.—Though comparatively inferior in point of size, the titoki has a strong claim on our attention from its extreme hardiness under all conditions. It is never touched by cattle, and is often found green and flourishing in the midst of the

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dying bush, as well as in the “second growth.” It is a remarkably handsome tree, with a dark glossy ash-like leaf and bright scarlet berry, and affords an excellent timber for all purposes where toughness and elasticity are required.

Pittosporums.—The Pittosporums form a large class, and are distributed more or less all over the country. They are of no great size, and of little account as timber trees; but, being extremely hardy and perfectly cattle-resistant, their graceful outline and beautiful foliage add greatly to the appearance of the forest. Like the titoki, they are often found in increasing quantities as the old bush dies away, and it is not uncommon to meet with healthy plants springing up in shrubberies and garden-ground from seeds carried by the birds.

Fern-trees.—Much of the characteristic beauty of the New Zealand bush is owing to the presence of the fern-trees scattered through the undergrowth. Although botanists are able to distinguish a larger number, they are generally divided by bushmen and ordinary observers into three species.—viz., the tall waving korau or mamaku, the more robust ponga, and the short thickly growing wheki. The two latter are not much molested by cattle, unless the place is very heavily stocked, but the succulent fronds of the korau are immediately eaten whenever within reach. As, however, this species chiefly affects low and damp situations, it is frequently found in deep, narrow watercourses, where it forms beautiful palm-like groves secure from the attacks of the enemy.