Floaty Fluffs are plants found in both Super Mario Galaxy and Super Mario Galaxy 2. They can carry Mario with a slow descent over large gaps. Spinning will give Mario a small upwards boost. After the third spin, Mario can not get another boost. There would be a chamber of wind to direct Mario in the direction that he needs to get to the other planets.
261px-Floaty Fluff

Mario clings a Floaty Fluff