I would try to get the white stuff off the mushroom. I've had this happen to a rock of yumas. It started on one mushroom and spread over time. Eventually all but two of the yumas fell off the rock and dissolved. I asked my lfs about it (since it was a $100 rock....) and they said it was probably a bacterial infection and they suggested a Lugol's dip. So I did the dip at half strength (I lost some other mushrooms to a full stength dip so I thought half was better then nothing) and I believe it saved the last two yumas.
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