2 hours ago, liuzhou said:
Porcini and shiitake aren't normally a problem A good shake should dislodge most dust.
Oyster mushrooms aren't one kind of mushroom. It's a group. I wouldn't recommend drying them. It's very difficult. They're mostly water and you'd be left with next to nothing grindable.
The ones to be careful of include morels and others with obvious places for dust, dirt, insects etc to hide.
All the mushrooms are already dried. The package said "oyster mushrooms." so that's what I know. I'm not very knowledgeable about 'shrooms. Thanks for your help.