You can't tell for sure if a mushroom is poisonous by looking at it, unless you are an expert at identifying mushrooms. There are no tests to help you tell a poisonous mushroom from a nonpoisonous mushroom. Yes, a little.
Mushrooms growing in the ground are more dangerous than mushrooms growing on living trees.
Mushrooms on the ground in forests are usually more dangerous than mushrooms on lawns. Early symptoms of mushroom poisoning include feeling sick, stomach cramps, vomiting and watery or bloody diarrhea. If your child has any of these symptoms, call your doctor right away. Your child may need treatment. There are thousands of kinds of mushrooms in North America.