Auricularia auricula is a kind of food that we usually eat. It is very delicious when cooked with some nutritious foods. There are many kinds of Auricularia auricula, which can be divided into four grades. So what grades of Auricularia auricula are there? Friends from other places should not know this black fungus, so what is black fungus? As long as we know what auricularia auricula is, we will know more about this food. What is auricularia auricula? Here, I will give you a specific explanation of this black fungus. Auricularia auricula, alias Auricularia auricula and Auricularia auricula. Mycology belongs to Basidiomycetes, Auricularia, Auricularia. It is dark brown in color, soft in texture, delicious in taste and rich in nutrition. It not only adds elegance to China cuisine, but also nourishes blood, makes the skin rosy and radiant, and can prevent and treat iron deficiency anemia and other medicinal effects. Mainly distributed in Heilongjiang, Jilin, Fujian, Taiwan Province, Hubei, Guangdong, Guangxi, Sichuan, Guizhou, Yunnan and other places. It grows on rotten wood of oak, poplar, Ficus, Sophora japonica, etc. 120 kinds of broad-leaved trees, and it is solitary or group. At present, basswood and bag materials are the main artificial cultivation methods. Classification of Auricularia auricula 1, Grade A (spring ear): The spring ear is mainly harvested before the light summer, with blue face, gray bottom, luster, thick flesh and large expansion rate; The meat layer is tough, elastic, free from sand and insects, and free from curly ears and fist ears (which are stuck together due to excessive maturity and long-term drying). Classification of Auricularia auricula 2. Class B (Fuer): Fuer (mainly harvested before summer in beginning of autumn), with cyan surface and grayish brown bottom, complete flower shape, and no sediment and insects. Grade Classification of Auricularia auricula 3. Grade C (autumn ear): Autumn ear (mainly harvested after beginning of autumn), with dark brown color, different flower shapes, some broken ears and mouse ears (small fungus), and no sediment and insects. Grade classification of auricularia auricula 4. Grade D: those who do not meet the above specifications, do not have flowers or fragments, but are still fresh and edible. What is auricularia auricula? The above gives us four grades of auricularia auricula. We can eat different auricularia auricula in different seasons and spring ear in spring.