These are farm mushrooms.  
1. the spores are stored in bottle, detox and let it grow,
   subsequently, transferred to other bottles, detox - all these done in a clean sealed environments to
   without out bacteria.
2. preparation of the grow: they lay a layer of reed stalks, a layer of dry cowdung, a layer of wheat stalks and so on
3. thereafter, the spawning spores are pour over on the upper most layers.  there are many such "trays" in a roll. 
4. thereafter, the environment is moistened with water , then all the surrounding are completedly sealed with reed stalks, top and 
    bottom, Once a day, misty water is sprayed on.
5. within two weeks, the mushrooms are ready for harvest.    
Its organic - no artificial chemical.