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Let them dry out, they'll be dormant for a few weeks, but then you can hatch them if you like. Refrigerating them may be a good idea, so long as you keep them cool and dry they could last quite a while, years perhaps.
I believe it's done with its life cycle.
Keep them in the dark with plenty of food and moisture.
Your cultures is doomed - unless some part of it is still yellow and crawling it's well dead. As Evan's said the spores are dormant - takes around 3 weeks of being dry for them to activate. It's light exposure - once a plasmodium is more than a few days old exposure to light triggers sporulation.
Fridge is a good plan for storing.
Check later and I'll have guide to getting from spores to plasmodium - got a pressing bit of lab work to do first
Thanks! For some reason, it doesn't look like it is quite dead yet so we shall see...
I might consider hatching the spores but that can wait.