This is what my wood-decomposing mushroom cultures look like after the trash bag is filled with inoculated, peroxide-treated substrate and sealed with a twist tie. I leave the bag in the cardboard box until the mycelium knits the substrate together. There is no filter on the bag for gas exchange, as the thin plastic allows enough oxygen to diffuse through to the culture.
When the culture is ready to form mushrooms, I put a small slit in the side of the bag, and the mushrooms grow out the slit. [Next]
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