Sphereosis
From Tardis Wiki, the free Doctor Who reference
Sphereosis was a plant whose name meant 'that which feeds from underneath' . It fell very long ago, and there is no information as from where and when. It said it 'started to grow taking life and nutrients sending out its roots and feelers and tubers', slowly altering its genetic structure until it could walk. (AG: The Day of the Troll)
