Minecraft giant mushroom location introduction

A structure composed of 49 to 57 mushroom blocks (including 4 to 12 mushroom stems and 45 mushroom blocks), there are two types of giant mushrooms, red and brown.
Red is similar to a hollow tree, and brown is a flat top.
1.0 will naturally generate in the mushroom island biome, and 1.7.2 will naturally generate in the black forest biome. Giant mushrooms will also be generated in the swamp of the bedrock version.