From Tardis Wiki, the free Doctor Who reference

A mushroom was a fungus. The Great Power was an Earth mushroom that could bestow superhuman powers. (PROSE: Doctor Who and the Daleks)

The First Doctor, Vicki, Steven Taylor and Robert Zierath visited a planet with giant talking mushrooms. (PROSE: The Schoolboy's Story)

The Doctor's TARDIS assumed the form of a giant mushroom when it arrived on an alien planet. (AUDIO: The Beginning)

Mushrooms were among the ingredients of Nuthutch Foods' fungus cannelloni. (HOMEVID: Global Conspiracy?)

Planet One had jungles dense jungles with large mushroom-like structures. (TV: The Pandorica Opens)