when my friends teddy bear first began to make shroomies she used this recipe...1/2cup rice
1/3 cup H2O
Pinch of calcium
It looks like a cake, but when you are the teddy says that the cakes are nice and edible after they have fruited. The calcium seems to promote more rapid growth since it will take a while for the substrate to be fully colonized. (it is pure substrate.. and the mycelium will just take longer for full colonization.)
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To see the light is not enough.. brainnoise