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Portion of a section, showing the large sporangia in their natural position, and each supported by its bract or scale. c. Spores in these sporangia, highly magnified. In the Carboniferous strata of Coalbrook Dale, and in many other coal-fields, elongated cylindrical bodies, called fossil cones, named Lepidostrobus by M. Adolphe Brongniart, are met with.
Coming now to particular instances, we may turn our attention in the first place to the genus Sisymbrium. Two species are reputed to have bracts, Sisymbrium hirsutum and S. supinum. Each flower-stalk of their long racemes is situated in the aril of such a bract, and the peculiarity is quite a natural one, corresponding exactly to what is seen in the inflorescence of other families.
Among the new and interesting scrubs and trees which we met with at almost every step, I shall only mention a small Grevillea, from one to two feet in height, with pubescent pinnatifid leaves, and a simple or compound thyrsus of scarlet flowers; Cochlospermum gossypium, the native cotton tree of Port Essington, whose bright showy yellow blossoms and large capsules full of silky cotton, attracted our attention; its leaves are deciduous, and the trees were entirely leafless; a fine species of Calytrix on the rocks, and two of Loranthus on the drooping tea tree, the drooping foliage of which one of them imitated, whilst the other belonged to the group I mentioned as found at the Suttor, with its flowers inserted on a leafy bract.
The noble American linden, one of the really great trees of our forests, bears these delicate whitish flowers, held in rich clusters from a single stem which is attached for part of its length to a curious long green bract.
During my absence, my companions found a quantity of implements and ornaments of the natives, in the neighbourhood of our last camp. On the plains I found two new species of Sida; and, on the tea-trees, a new form of Loranthus, with flowers in threes on a broad leafy bract, scarcely distinguishable from the real leaves. March 20. We travelled down to the water-holes, at which I had turned back.
Leaves it has none, just a scarious brown bract that encloses a part of the stem. Living upon canned food, so to speak, it has lost its ability to win sustenance from earth and air. It seems to live, not upon the sap of these trees, but upon the dead roots and decayed wood, a specially prepared humus without which it may not thrive, even in its own limited, elusive way.
'Si quis turbida seditione iricendium fecerit nequiter et in felonia, vel ob inimicitias, vel praedandi causa, capital puniatur pcena vel sententia. Bract. L. 3. c. 27. He defines it as commissible by burning 'cedes alien as. Ib. Britton, c. 9.
Here comes out around me at this moment the new June, the leaves say June, though the calendar says May, and we must needs hail our young relatives again, though with something of the gravity of adult sons and daughters receiving a late-born brother or sister. Nature herself seems a little ashamed of a law so monstrous, billions of summers, and now the old game again without a new bract or sepal.
Sometimes the flower-stems or peduncles are branched, bearing two or three flowers, and in that case there may be a small green leaf or bract where the fork arises. The placing of the petals in the bud at the epoch of expansion may differ in two flowers on the same tree.
Flower. The most characteristic feature of the Angiosperm is the flower, which shows remarkable variety in form and elaboration, and supplies the most trustworthy characters for the distinction of the series and families or natural orders, into which the group is divided. Except where it is terminal it arises, like the leaf-shoot, in the axil of a leaf, which is then known as a bract.
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