Hoothi

The Hoothi were fungoid creatures of an unknown origin.

Biology
The Hoothi could exist either as spores or as planet-sized gas spheres that allowed them to travel through space. They lived on decaying organic matter.

History
The Hoothi had knowledge of the Time Lords and the Doctor, possibly from a previous encounter.

In the year 2570, the Doctor Ace and Bernice Summerfield encountered the Hoothi on Heaven. (NA: Love and War)