Buy Shrooms Online.The Golden Teacher psilocybe cubensis is a great mushroom for beginners. The G.T. mushroom spore is a slow colonizer with rizomorphic mycelium. The Golden Teacher will fruit you flush after flush on a Brown rice flower (BRF) substrate. The beautiful golden colored mushroom caps and it’s wise teachings has given the Golden Teacher it’s name. The Golden teachers mushrooms grow medium sized to huge in the right conditions.