A tree must be well balanced to be beautiful, for it may have form and lightness, and yet lose its effect from not being properly poised; though occasionally beauty may be found in an unbalanced tree, yet this must be caused by some peculiarity in its situation. For instance, when hanging over a rock, if altogether unpoised, it may be beautiful; or bending over a road, its effect may be good.
We have often admired the massy trunk of an aged forest oak; and Gilpin says he frequently examined the varied tints which enriched its furrowed stem. The genuine bark of an oak is ash-coloured, though it is not easy to distinguish this, from the quantity of moss which overspreads it; for we suppose every oak has more or less of these picturesque appendages. About the roots there is a green velvet moss, which is found in a greater degree to occupy the hole of the beech, though its beauty and brilliancy lose much when in decay. As the trunk rises, you see the brimstone colour taking possession in patches. Of this there are two principal kinds: a smooth sort, which spreads like a scurf over the bark, and a rougher sort, which hangs in little rich knots and fringes. This sometimes inclines to an olive hue, and occasionally to a light-green. Intermixed with these mosses is frequently found a species perfectly white. Here and there, a touch of it gives lustre to the trunk, and has its effect; yet, on the whole, it is a nuisance, for as it generally begins to thrive when the other mosses begin to wither, it is rarely accompanied with any of the more beautiful species of its kind. This is a sure sign that the vigour of the tree is declining. There is another species of a dark brown colour, inclining to black; another of an ashy colour; and another of a dingy yellow. Touches of red are also observable, and occasionally, though rarely, a bright yellow, which is like a gleam of sunshine. These add a great richness to the trees, and when blended harmoniously, as they commonly are, the rough and furrowed trunk of an oak, thus adorned, is an object which will long detain the picturesque eye.
These and other incidental appendages to a tree are greatly subservient to the uses of the pencil, and the poet will now and then deign to deck his trees with these ornaments. He sometimes calls into being some mighty agent, as guardian of the woods, who cries out,
From Jove I am the Power
Of this fair wood, and live in oaken bower.
I nurse my saplings tall; and cleanse their rind
From vegetating filth of every kind;
And all my plants I save from nightly ill
Of noisome winds, and blasting vapours chill.
The blasted tree adds much to effect, both in artificial and natural landscape. In some scenes it is nearly essential. When the dreary heath is spread before the eye, and ideas of wildness and desolation are required, what more suitable accompaniment can be imagined, than the blasted oak, ragged, scathed, and leafless, shooting its peeled white branches athwart the gathering blackness of some rising storm?
As when heaven's fire
Hath scathed the forest oak, or mountain pine,
With singed top its stately growth, though bare,
Stands on the blasted heath.
—beneath that oak,
Whose shattered majesty hath felt the stroke
Of Heaven's own thunder—yet it proudly heaves
A giant sceptre wreathed with blasted leaves—
As though it dared the elements.
Neale.
Ivy also gives great richness to an old trunk, both by its stem, which often winds round it in thick, hairy, irregular volumes; and by its leaf, which either decks the furrowed bark, or creeps among the branches, or carelessly hangs from them. It unites with the mosses, and other furniture of the trees, in adorning and enriching it.
The tribes of mosses, lichens, and liver-worts, are all parasitical; it is doubted whether the ivy is or not. The former, however, are absolute retainers. The character of the ivy, too, has been misrepresented, if his feelers have not some other purpose than that of enabling him to show his attachment to his patient supporter. Shakspeare asserts that he makes a property of him:
He was
The ivy which had hid my princely trunk,
And sucked my verdure out.