These are known as the 'Vomiter or Green-spored Parasol'. These mushrooms grow on lawns and in the ​grass all over North America and also is the leading cause of wild mushroom poisoning here. These mushrooms are poisonous, but in most incidents it is non-fatal. You will, however, spend a lot of time vomiting (hence the name 'the Vomiter'). There are lots of edible mushrooms and this one is commonly mistaken for one, so there's no wonder it's the leading cause of wild mushroom poisoning.

I found these growing at my parent's house during my last visit. They have a dog and I wasn't sure if these mushrooms were safe for the pup. After a search and using online I.D. tools, I found that it is not safe for pets, so I removed them. I take my kids over there to play and did not want them eating them by mistake either.

Had I not looked them up, I might have just left them in the grass because they are pretty cool looking! I'm glad I looked them up now. I would have felt terrible if I had left them and my parent's dog or my children gotten them. It is, from what I've read, a terribly unpleasant experience.

These are edible and look strikingly similar.