Are wild mushrooms in the lawn harmful to pets?
I'd think yes, if they ate them.
Mushrooms in your lawn is a sign that your lawn is full of healthy organic matter which feed the fungus. this may be from a dead tree or roots under the lawn. You can dig up the dirt where the mushrooms grow and replace it with different dirt but you have to be careful not to spread the spores from the musroom to the rest of your lawn. You can also just allow them to…
You can eat some wild mushrooms that are quite good, BUT there are wild mushrooms out there that look exactly like the edibles that can make you be in bad pain for 12 hours and then kill you. So I would not eat wild mushrooms unless you know what your doing. Just don't want any one to die from eating mushrooms.
Is it illegal for Psilocybe Cubensis mushrooms to be growing in the lawn They are not being cultivated in any way just growing wild?
No, it is not illegal as long as the mushrooms naturally appeared and are not picked. Additional due to the rarity of prosecutions for actual magic mushroom cultivation, it is exceedingly unlikely that an individual with magic mushrooms growing in their yard would ever be arrested or face criminal charges.