Mycelium
Mycelium was the vegetative mass of a fungus, similar to the roots of a plant.

The mycelium of the fungal species Prototaxites stellaviatori was composed of exotic material found not only in normal space but in a discrete subspace domain known as the mycelial network, that spanned the universe and beyond. Any matter that entered the network was quickly decomposed by the mycelium; this process was carried out by the jahSepp, who recycled the matter into forms usable by the network. ()

Spore drive used mycelium spores from this species to travel along the mycelial network. ()

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Fungi