Here's a TRUE deadly mushroom story - my 3rd grade teacher and his first wife picked some in Upstate NY, don't know what kind. she died, he survived (after being quite ill) and when I was in Highschool, he married my 9th grade English teacher. happy ending!

As for storing mushrooms for future use - only way I ever managed was to preserve them was to flash fry them in roasted garlic flavored olive oil and then store them in more oil - or - drying them in a dehydrator. Freezing fresh mushrooms results in slime.