Every lawn has mushrooms occasionally. In fact, I've read that mushrooms are a sign of a healthy soil. However, we have two places where there is a plethora of mushrooms that suddenly appeared. Both are areas in the lawn that appeared to be less than optimal as far as grass health, which I think were areas where mule deer bedded down. There's no other explanation since they've been watered, mowed and fertilized like the rest of it. It's a relatively heavily shaded lawn and this makes it ideal for a deer to rest in the heat of the day. We have more than enough deer in town in Prineville. So, I'm wondering if mule deer can transport mushroom spores and deposit them where they rest? This is a strange question, but I've never seen this in our yard before and we've lived here almost 40 years.