rhizomorph

/ˈraɪzoʊˌmɔrf/
noun
  1. A rootlike structure made of fungal threads that helps fungi spread through soil or wood.
    • Rhizomorphs allow the fungus to travel long distances through the forest floor.
    • The honey fungus spreads through dark rhizomorphs that look like black shoelaces underground.
    • Scientists found rhizomorphs in the rotting log, showing the fungus was actively growing.
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