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If it is really whispy looking and grey it sounds to me like it is definately cobweb mold.
Mix up a 1/10 hydrgen peroxide,water solution in a spray bottle and lightly mist the infected area and it should knock it back. You will probably have to do this daily in order to control or completely eradicate this pesky contam. It isnt dangerous,like many other contams,but it does grow VERY fast and you will need to act immidiately in order to have a chance at killing it off.
It will hinder the growth of your shrooms too!
There are many good pics and a lot of good info in the faq's on contams if you need further clarification.