Yowzers that's a lot of oysters! The two big jars full of the dried shrooms makes me green with envy.
The great mushroom identification tome is Mushrooms Demystified by David Arora. He's based on the west coast but the information can be applied anywhere. There are also regional mushroom guides available for your specific part of the county. But unless you're walking around with an expert, a good book (or preferably 3) are the only safeguards you have between a delicious meal and a terrible, agonizing death..
Be careful out there! And if you're ever not sure about a mushroom, PM me and I might be able to help