Fern (fern)
This is about four hundred million years ago appears in the Devonian period of low growth of wood plants in general. They need water as a part of recycling, and began a variety of different types of derivatives, in the vitality of today is still a very strong plants.
Fern (pteridophyta) is the lowest higher plants. Flourished in the Carboniferous, there was as high as 20-30m tall plants. Reproduce by spores. Some types of edible, medicinal and ornamental.
Earth is the high quality coal is essentially a large Carboniferous ferns formed. The vast majority of these ferns in the Mesozoic prior to extinction. Today, more than the growth of their offspring in the humid jungles of the dark, and mostly small type.
Alternation of generations: the plant life cycle, the first generation on behalf of asexual reproduction, while the second generation of a generation of sexual reproduction.
Higher plants, ferns are a large class of primitive groups, is the earliest land plants. This plant is grown herbs in the mountains, has a stubborn and strong vitality, are found in temperate and tropical world.
"Fern" first appeared in China's "Book of Songs." "Book of Songs" in the "Introduction adopt the fern," the words. Many of its aliases, the ancient call fern dichotoma, on Seoul, Qi, etc., leading private and call it food, fern, fern meters, wishful dishes.
Fern, also known as ferns. In the Paleozoic, wood fern scales, very tall and reed wood, and later became extinct, buried in the strata formed the coal. Modern living ferns, in addition to the world's only surviving Alsophila is woody, the others were herbs.
Ferns do not flower, no fruit and seeds, are spores to reproduce. It can be divided into pine needles ferns, club mosses, hor_set_ails (The above is intended to ferns), and true ferns (ferns) 4 classes.
Annual rhizome fern leaves can grow anywhere, the leaves curled the upper, outside the hair was white, in ancient times called for the "fist cuisine" or "fern boxing." Leaves grew up, gave birth on the petiole and beautiful pinnate dark green. Wild in the mountains of the fern simple and robust, which rely mainly on the back of that brown or yellow leaves, spores scattered in damp places, after a complicated process, developing into a new fern.
Fern leaves vary greatly, as small as less than 1 cm, length up to several meters. That grows in tropical tree ferns, stands alone, high up to 24 meters, 5 meters long apical pinnate fronds, like a big tree. However, completely different fern leaves, fern leaves, such as pine needles protruding like a small flake stem; wood thieves Ye Zicheng sheath-like, tight package Festival; Lycopodium needle leaves, dense stems.
Some 12,000 kinds of ferns around the world. Fern is widely used. Many types of edible shoots as a vegetable, such as the fern, fresh and delicious, the "Mushroom King" in the world. Many fern rhizome contains a lot of starch, could be wine or sugar. Angiopteris underground root weight of up to 20 to 30 kg. Many species are well-known medicinal plants, such as Lycopodium, Guanzhong and so on. Azolla and Salvinia is a daisy and other feed, but also a fertilizer. |