Hoothi

The Hoothi were fungoid creatures of an unknown origin.

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

History
The Hoothi knew of the Time Lords and the Doctor.

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

Other references
Upon seeing a toy Dalek in a child's toybox, Benny mused that there could have been a fluffy Hoothi in amongst the toys also. (PROSE: Sleepy)

Behind the scenes

 * A Sisterhood of Karn member in TV: The Brain of Morbius mentions the Hooti. This was a mistake on the actress' part; it was scripted as Moothi. (DOC: Getting a Head)