The Stametisian Rule of Psilocybin Mushrooms
"IF the flesh stains blue, AND the spore print in purple to black, then it is most likely a psilocybin mushroom. Although i don't know of an exception to this rule doesn't mean there isn't one."
Although i would never recommend picking mushrooms without an experienced person present this is a pretty good rule. A spore print can be taken by laying a mushroom cap over a piece of white paper for a few hours until the spore drop, leaving a print of the gill structure, examine the colour from this. Also, when bruising the flesh of the mushroom do not confuse blue with blackor brown, it is a very distinct shade of blue, so if you think maybe it might not be blue then it probably isn't
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"At this stage of human evolution those who aren't on psychedelics aren't, in fact, truly human"