Alsophila.

The eucalyptus, also known as the eucalyptus, is the only remaining woody ferns of the day and is extremely precious. Ferns are an ancient and primitive plant, and most of the existing ferns are herbs. In the age of dinosaur life 200 million years ago, the trees were all over the world, tall and lush. As a result of geological changes, the vast majority have been extinct, buried in the ground into coal, only a very small number survived.

in tropical forests, 3 to 8 meters high, in the Forest of the South Pacific Islands, the highest up to about 20 meters, is the world's tallest ferns. The trunk of the tree is round, a bit like a coconut tree, with branches on it, with dredging or hexagonal markings. Only at the top of the tree are many large, long plume-shaped compound leaves that stretch around.

the eucalyptus tree has no flowers, nor does it result in actual and seeds. On the back of its leaves are many spore sacs that look like a small yellow dot with many spores that they reproduce on.

spores mature and disperse with the wind and fall into the soil, first germinated into a heart-shaped green flat primary leaf, which can be photocheditored. The belly has false roots and can live independently. In front of the abdomen of the primary leaf body has a cervical egg device, in the second half of it has a sperm device, so also known as a "matching body", when the sperm matures, can use a lot of whiplash in the water swimming into the neck egg, and egg cells combined to form a joint. The helios still absorb the nutrients on the original leaf body, gradually develop into embryos, and then grow into a new tree.

in Yunnan, Guizhou, Guangdong and other places in the warm and wet places also have the distribution of radon. Because of its rarity and preciousness, it is classified as a class of protected plants by the state.

of radon are rich in starch, edible, and can also be used to make objects. The drug is called "dragon wind", can drive rheumatism, strong ribs, clean heat cough.