To dream of psilocybin mushrooms represents your feelings about a situation being wonderful to notice all by yourself. An experience is nice to have as long as other people don't find out or interrupt you. It may also reflect feelings of excitement about doing something dangerous.
Example: A young man dreamed of being given psilocybin mushrooms, but was afraid to take them. In waking life he was deeply in debt and his dying father whom he hated gave him full access to all his bank accounts while he was hospitalized. The psilocybin mushrooms reflected the exhilarating risky potential in his hands to pay off all his debts without his Dad knowing about it.