Surprisingly, we've had the most success storing mushrooms in their original packaging, which is also what the test cooks at Cook's Illustrated Magazine recommend. If we know it's going to be a few days until we cook them, we just put the mushrooms directly in the fridge still in their shrink-wrapped container. Unopened, we've had mushrooms keep with very little browning for over a week!
If we know we're not going to use an entire container of mushrooms, we make a small opening in the plastic wrap toward one end of the container and draw out just what we need. You can then re-wrap that half of the container with plastic wrap. We also sometimes just put the container in a large zip-top plastic bag and push out most of the air before closing.
When buying loose mushrooms, try putting those you don't use right away in the smallest size container that will hold all the mushrooms and then wrapping the container (without its lid) with plastic wrap. Poke a few small holes in the plastic wrap to let air escape (mimicking commercial packaging).
All mushrooms can be stored in the fridge or other 40-45° environment. Mushrooms actually continue to grow after picking and refrigeration slows down their metabolism.
What do you think - is this really the best way to store mushrooms?
(Image: Emma Christensen for the Kitchn)