DonateIs this contamination?
this a chestnut liquid culture that I forgot for about 3/4 days
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Hello! Looks like healthy mycelium growth on the top of your LC.
In order to avoid mycelium growth on the top and mycelium clamps your should shake it every 2-4 days. Do you shake it from time to time? How old is your LC (since inoculation)? Do you store it at room temperature or in the fridge?
Check out this paragraph for more details: Step 6. Shake the Liquid Culture