It doesn't 'spread' to anything, but will grow naturally on dirt which is placed in a Large Mushroom biome, like grass grows on it in other biomes.
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To grow mushrooms:You need: Mycelium, Red Mushroom orBrown Mushroom & Bone Meal.Firstly: Place the Mycelium on a open area,Secondly: Place the Re Mushroom or Brown Mushroom on the Mycelium,Thirdly: select the Bone Meal, & Right click on the Red Mushroomor Brown Mushroom.
No its not it was made up and then people spread the rumour that it was real.
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You can email Minecraft if you have any questions about Minecraft. That's what the Minecraft Help Email is.
There are no schools in Minecraft and/or a school that teaches minecraft.