Master Culture Slants
Mushroom mycelium is a living organism. It grows by dividing cells. As with all living creatures, there is a limited number of cell divisions that can occur before the organism grows old, slows down, and then eventually dies. With fungi, we refer to this process of degeneration as senescence.
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If you choose not to use wood in your culture slants, I'd suggest making transfers at least twice per year to avoid losing your cultures. When making transfers from culture slants, cut a small piece of mycelium and transfer it to a Petri dish. Allow it to grow out approximately 1 cm(unless contamination appears sooner), and then transfer from the leading edge of the growth to a new Petri dish. Once the mycelium on the second dish grows out 1cm, if no contamination has become evident, place a tiny piece of mycelium from the leading edge into a fresh test tube slant for further storage. The remaining mycelium on the Petri dish can then be used to inoculate grains for mushroom growing.
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