United States or Spain ? Vote for the TOP Country of the Week !
I also saw in 1866, in Portland, a smaller dirt-bed six feet below the principal one, six inches thick, consisting of brown earth with upright Cycads of the same species, Mantellia nidiformis, as those found in the upper bed, but no Coniferae.
Vegetation of the Coal Period. Ferns, Lycopodiaceae, Equisetaceae, Sigillariae, Stigmariae, Coniferae. Angiosperms. Climate of the Coal Period. Mountain Limestone. Marine Fauna of the Carboniferous Period. Corals. Bryozoa, Crinoidea. Mollusca. Great Number of fossil Fish. Foraminifera.
The term and its antonym were maintained by Linnaeus with the same sense, but with restricted application, in the names of the orders of his class Didynamia. Its use with any approach to its modern scope only became possible after Robert Brown had established in 1827 the existence of truly naked seeds in the Cycadeae and Coniferae, entitling them to be correctly called Gymnosperms.
The mode of growth of the Coniferae recalls a feature of the Equisetaceae also, in the tufts of little leaves which appear in whorls at regular intervals along the length of the stem in proportion as it elongates, reminding one of the articulations on the stem of the Equisetaceae.
Probably the thickness of the whole Wealden series, as seen in Swanage Bay, can not be estimated as less than 2000 feet. The flora of the Wealden is characterised by a great abundance of Coniferae, Cycadeae, anD Ferns, and by the absence of leaves and fruits of Dicotyledonous Angiosperms.
"The cypress tribe," said Miss Harson, "differ from the pines, or Coniferae, by not having their fruit in a true cone, but in a roundish head which consists of a small number of scales, sometimes forming a sort of berry. One of the most common of this family is the arbor vitae, or tree of life a tree so small as to look like a pointed shrub, and more used for fences than for ornament.
From these characteristics it is evident that the Bee prepares her gum with the resinous drops exuded by the Coniferae. I think that I am even able to name the particular plant, though I have never caught the insect in the act of gathering its materials. Hard by the stone-heaps which I turn over for my collections there is a plentiful supply of brown-berried junipers.
All botanists admit that the abundance of ferns implies a moist atmosphere. But the coniferae, says Hooker, are of more doubtful import, as they are found in hot and dry, and in cold and dry climates; in hot and moist, and in cold and moist regions.
It belonged to the order Coniferae, or cone-bearing trees, as was evident from the cone-shaped fruits that hung upon its branches, as well as from its needle-like evergreen leaves. The cone-bearing trees of America are divided by botanists into three great sub-orders the Pines, the Cypresses, and the Yews. Each of these includes several genera.
Nowhere within the limits of California are the forests of yellow pine so extensive and exclusive as on the headwaters of the Pitt. They cover the mountains and all the lower slopes that border the wide, open valleys which abound there, pressing forward in imposing ranks, seemingly the hardiest and most firmly established of all the northern coniferae.
Word Of The Day