Qingchuan black fungus is also called black fungus, cloud ear, wood moth, black cabbage, and elm ear. Because of its unique growth environment, rich nutritional value and huge market prospects, it is as famous as Tremella fuciformis and is the best black fungus of its kind. It has the functions of nourishing and strengthening the body, clearing the lungs and replenishing qi, cleansing the gastrointestinal tract, nourishing blood and activating blood circulation, calming and relieving pain, etc. It is an important health food. Guangyuan City is an important production area of ??black fungus in the country. It has a history of more than 1,000 years. Qingchuan black fungus is famous for its unique quality. It has been protected by the National Geographical Indication Product of Origin and has been designated as the "Black Fungus Quality Standard" by the country. ". In 2008, Qingchuan black fungus was rated as a Chinese famous brand. In 2009, 21 million sections of black fungus were planted densely in the city, achieving an output of 3,100 tons. The remaining materials from the black fungus cultivation in the densely planted sections of wood were used to develop mountain delicacies such as bamboo fungus and bagged mushrooms, achieving an output of 5,000 tons. By 2012, Qingchuan black fungus reached 34 million sections and achieved a production of 5,000 tons. Build Guangyuan into an important black fungus production and export base in the country, and build Qingchuan black fungus into a well-known trademark in China. The production and development of black fungus in Qingchuan has mainly gone through three periods: the first period is the natural growth period (wild period). Before the 1950s, it mainly relied on cutting down green trees and other oil-free tree species, and relying on natural decay. Breeding; the second period was after the founding of the People's Republic of China, by collecting wild black fungus specimens to isolate and produce strains, and then cultivate them. With the continuous replacement of strain varieties, the yield also increased significantly; the third period was In 2009, in recent years, the promotion and application of new techniques such as dense planting of sections and bag cultivation have brought the output to a new level.