This is highly recommend method for keeping shrooms for extended periods. Go to your local pharmacy or supermarket and buy some Garlic and Horseradish pills, which are nice clear capsules. Powderise your shrooms in a little coffee grinder or such appliance, and replace the shroom powder in the capsules. This can take a little while if you have lots of fungi, and you end up with your fingers covered with spores, but its worthwhile. This also masks the taste extremely well for those who dont like the flavour....... Another method is to make tea and then freeze the tea into ice cubes, havent tried this method but have heard you can store them for ages..... Anyone got any good ones.....?
lol. They will be fine. Try to keep them out of light and heat. The longer you keep them the less potent they will become (over time). They are fine in your closet though.
Just make sure that the mushrooms are 100% dry and they should be absolutely fine in a dark cool closet. If they are still a little wet, though, you're asking for mold.