Then, gently cut the stem at the root bulb. When this substrate is colonized by the mushroom mycelium (also called the vegetative growth of the mushroom), it is then called spawn. The PF-Tek for Simple Minds uses ½ pint (~240ml) canning jars or drinking glasses and a growing substrate made of vermiculite, brown rice flour and water.These include visual distortions, enhanced colors, lightness or giddiness, and powerful