栽培食用菌 ,菌种的质量优劣 ,直接影响到食用菌生产的成败和产量的高低。因此 ,为了买到优良菌种 ,在选购时要注意如下几点 :一闻 :就是闻菌种的气味。购买菌种时 ,必须打开１～２瓶（袋）闻一闻 ,如有独特的香菇味 ,则为优良菌种 ,如有酸味、霉味和臭味 ,说明菌种已被杂菌污 Cultivation of edible fungi, the quality of the strains, directly affect the success of the production of edible fungi and the level of production. Therefore, in order to buy good strains, in the purchase should pay attention to the following points: A smell: that smell of bacteria species. Buy bacteria, you must open 1 to 2 bottles (bags) smell the smell, if the unique flavor of mushrooms, then fine strains, such as sour, musty and odor, indicating that bacteria have been contaminated bacteria