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Have you tried brushing the mushroom with something or blowing a stream of water at it with a turkey baster to see if they blow off, or move? You could even pull the frag out of the tank, put it in a small container of tank water and try pulling GENTLY at the white spots with a pair of tweezers to see if they come off.
How long have you had the mushroom?
It's possible these are some kind of pest or could even be part of the mushrooms own body. It's almost impossible to tell without more info. Also, if you pull it out of the tank, let it get comfortable in the small container and take some photos of it under normal room lighting, both the entire mushroom and, if possible, very up close and personal.