Storage: Store dried mushrooms in an air-tight container or zip top bag in a cool, dry, dark cupboard.
Shelf Life: Dried mushrooms will retain their flavor for at least a year, but likely far longer.

Dried Italian porcinis add tremendous depth of flavor to almost any dish. They can be reconstituted before use and added to pasta dishes, steaks, and other entrees or added dry to simmering stews, sauces, soups and braised meat dishes where they will rehydrate and impart flavor during the cooking process.
If you’re rehydrating your wild Italian porcinis separately, be sure to save the soaking water, it can be used as a delicious soup base or in place of stock in a variety of other recipes (it’s especially good in risotto!).
How to Reconstitute Dried Mushrooms
Porcini Mushroom Recipes
Dried Mushroom Recipes & Techniques