I would answer that question in this matter. "Yes, you may find many mushrooms which are unknown or common to your knowledge. The chances of them being a mushroom in which would cause unwanted effects, such as inducing unconciousness, coma, or even death is by far a greater chance. Muchrooms can be very similiar in features. It takes a professional to truly tell the difference. They can take it to a lab and take samples of the spore area. This is almost a sure way.