Wheat grains are used as the tissue culture medium to produce the spawn which is essentially a mushroom "starter" culture used to inoculate the final mushroom-producing cultures. Look! the white color dots is the "little baby mushroom" which will then propagate and "infect" whole bag of wheat grains (brown color) and become white color.
The growing medium (sawdust+blended rice+lime) were mixed and packed into the "plastic beg bottle" manually by the workers. "so conventional"Next the spawn is inoculated into the sterile growing medium and the growing takes place in to "plastic beg bottle"
In two to three weeks, the bottle becomes filled with the root structure of the mushroom (So called mycelium). The temperature and the humidity of the room must be carefully controlled in order for the mycelium to develop fully and eventually little mushroom form on the mycelium and push up through the open of the bottle.
Grey oyster mushrooms
White oyster mushrooms