1, Porphyra, is a general term for algae that grow alternately in the sea. Rhodophyta, Saussurea. Algae are membranous and called phyllodes. Purple or brownish green. The shape varies from species to species. Porphyra is a kind of marine red algae. The thallus is composed of a layer of cells embedded in a thin layer of colloid, which is dark brown, red or purple. Porphyra fixer is disk-shaped and rhizoid.

2. It grows on the rocks in the intertidal zone of shallow sea. There are many kinds, mainly Porphyra yezoensis, Porphyra haitanensis and Porphyra haitanensis. Artificial farming has been carried out in the coastal areas of China. At the beginning of the 20th century, the production of laver in China jumped to the first place in the world. Rich in protein and iodine, phosphorus, calcium and so on. Food and medicine [20]. At the same time, laver can also be used as medicine to make traditional Chinese medicine, which has the effects of resolving phlegm, softening hardness, clearing heat and promoting diuresis, tonifying kidney and nourishing heart.