In layman’s terms, they are the “seeds” used to produce edible fungi. It is different from the seeds of higher plants. Broadly speaking, strains refer to spores, tissues or mycelium with the ability to reproduce and relatively stable genetic characteristics and their nutritional or nutritional properties for the purpose of preservation, testing, cultivation and other purposes. Non-nutritional carrier. Bacteria are an important biological resource. According to the different purposes of their use, they can be mainly divided into strains for preservation, strains for testing and strains for production. From the perspective of edible fungi cultivation, that is, in a narrow sense, it refers to bacterial strains for production, that is, mycelium that is purely cultured with a suitable nutrient medium as a carrier, that is, a combination of culture medium and mycelium. Generally, it is packaged in certain containers, such as test tubes, glass bottles, plastic bags and other containers.