Mushroom Groves Sub Biome

Mushroom groves would be a cluster of medium and small mushrooms growing in various biomes. They would Span maybe 20-50 blocks in diameter. These would grow in forests, like dark oak, oak, birch, jungle, taigas, and maybe savannah. They could also be found in plains biomes. They would mingle with local flora, and provide new life to these biomes. Things like Fairy's and Imps could spawn from these groves.