I made a batch of wimpy beer to propagate enough yeast to make my massive barleywine 3 weeks ago. I havn't had time to make my barleywine because of my schedule so I just left the beer on the yeastcake. Today I got my stuff out to make my barleywine and discovered there's some white stuff growing on top of my beer... It appears to be mold, i think. It's white and looks powdery... should I throw out my batch of yeast? I'm thinking that I will... That beer's going in a keg this afternoon reguardless... think the beer in the primary is still good with that crap growing on top? someone please, HELP!!!