The Memoryshroom is a power-up made for the upcoming fanon game Super Mario Galaxy 9.
The Memoryshroom is a Mushroom with a white cap, while Memory Mario is Rainbow Mario but entirely white and with no Mario fadeaway.
The Memoryshroom has no initial effect, but when Mario gets another power-up, the Memoryshroom "remembers" it. The next time Mario gets a Memoryshroom, he will get the power-up the Memoryshroom had remembered.
- Memoryshroom is based off of memory foam.