White mushrooms

These mushrooms would grow in shimmering caves and would have a ghostly appearance to them. In order to grow they must be within the light radius of the shimmerock ore. (There's a separate idea for "Shimmering caves" in Structures category and another idea for "Shimmerock" in Blocks\Tools\Items category). These mushrooms could be used in four ways. 1. Additional food source for mushroom stews. 2. It could be used in composter and would have a high level of compost-ability, making them quite useful. But they would be rare, so they wouldn't be overpowered. 3. To make a new potion which could make you invisible to phantoms for a few minutes. 4. For decoration.