Hyphae and Mycelium
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A hypha is a single fungal filament; a mycelium is the interconnected mass of hyphae that makes up a fungus's feeding body.
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The honey mushroom's mycelium spreads underground across a vast area, making it, by extent, among the largest known organisms.
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The visible mushroom is only a reproductive structure — most of a fungus's body is unseen mycelium in its substrate.