Fungi in my plant pot

One morning as I trimmed the vigorously growing mint in one of the pots in the balcony these interesting looking fungi showed themselves. Had been quietly flourishing for atleast a few weeks if not more. Would be nice if someone knows more about them. Is it alright to have them growing around a food plant (mint, which we eat) or are they poisonous and to be exterminated? 

A friend observes that I am lucky to have them and it's not so easy to grow such things intentionally. Well!