I've always wanted to learn how to forage for my own mushrooms. On a recent trip to France, I purchased an Opinel mushroom knife that's specially made for mushroom collecting. The curved blade has teeth on one end, which helps scrape rough coatings from stems, and the blade folds into the handle when not in use. The curved shape of the blade makes it easy to get to the stem you're cutting. The knife has a stiff boar bristle brush on one end for brushing soil off the stems and caps.
Opinel knives are high-quality and made in the French Alps region of Savoie. They have beechwood handles and high-carbon steel blades, and their construction is very simple. As there is no spring that holds the blade open, they have a locking collar that holds the blade in place when the knife is open. These knives are quite durable and low maintenance.
Can't go to France? Buy an Opinel mushroom knife online at Buffalo Gap Outfitters for $26.95. Find your local mycological society here, and take advantage of the mushroom picking season!