A Sand Mushroom is one of the many Mushrooms in the Mario series that so far, has only appeared in Super Mario Galaxy 2.5. It turns Mario into Sand Mario, where he can turn into a twister by spinning and turn back by spinning again and melt into a pile of sand by ducking. He can also walk on quick sand.
The Sand Mushroom makes it's first and only appearance in Super Mario Galaxy 2.5. It first appears in Dusty Stream Galaxy in the mission, What a Wind E. Storm, where it is used to battle King Wind E., a giant Tweester. He must use his power to push King Wind E. into a sink hole (which all quick sand is sucked in). Sand Mario must be careful not to fall into one himself.