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Bacterial resistant agar for growing mycelium?

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Location: Montreal, Quebec Canada
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I have a question pertaining to growing mycelium in agar.

I remember in my biology class in college, we grew the very early phases of plants on agar in petri dishes. For those who do not know, agar is a gelatinous substance like gelatine used all the time in cooking an science.

My fellow students were mindlessly contaminating their petri dishes while I was pulling my hair at the lack of sterility (I had been doing work with mushrooms and was used to much more thorough practices).
That is when ny tea her told me the agar had been trated with a coumpound which made it unfavorable for bacterial infection.

This got me thinking. Why do we not grow mycelium in similar agar? Would it not make mycologists' lives so much easier?

In the picture is the wonderful Lions Mane mushroom that tastes wonderful and looks incredible!

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Yes, antibiotic additions are commonly used in agar formulas for growing mushrooms.

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