Sporocarps lead normal growth tendency while the edge of fungus cap presents toothed and irregular status. The major reason is wind stimulation, meaning low humidity resulted from strong wind.
Control measures: In windy day, keep vents close or open vents in less time. When you are in urgent need of ventilation, open the vents of south under the condition of north wind, vice versa. Last, enhance the amount of water-spraying and lift the humidity of mushroom house.