Fungus

Fungus (plural: fungi) were a type of eukaryotic organism that included mushrooms, yeasts, and mold. Earth based fungi were noted for sharing a large amount of DNA with humans.

On Tarsus IV, seeds imported from Epsilon Sorona III interacted poorly with the soil, spawning a fungus that destroyed most of the planet's food supply. In the years following the crisis a great deal of work went in to prevent similar fungal infections from occurring elsewhere. .

Fungus could be used in the manufacturing of Ketracel-white. 

Doctor Mora Pol once suggested exposing an infant Changeling to fungi in order to train it to assume different shapes.