How to Store Mushrooms. These elegant vegetables are actually the fruit of underground fungi. Try not to store them for long, or you'll lose the delicate flavor.
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If the mushrooms are prepackaged, leave them in the packaging.
If the mushrooms are loose, place them in a paper bag and loosely fold the top of the bag over, or place them in a glass container and cover it with a dish towel or moist paper towel. Be sure to allow air circulation.
Store the mushrooms in the refrigerator, but not in the crisper.
Use the mushrooms within a few days, or within a week if they are packaged and unopened.