you could trip from mushies you found, but you must be SURE they're the good kind of mushrooms, and not the die horribly kind lol. get a good book on mycology (study of mushrooms), and dont eat anything unless you're 100% sure its ok enjoy your trip!
i'm not saying go buy a book, skim through it and eat whatever you like. i'm saying to make sure that you know what you're doing - which i said clearly in my first post