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Rhizomorphs of Lycoperdon pyriforme

Rhizomorphs are bundles of hundreds or thousdnds of hyphae encase in a pseudoparenchymatous sheath that function to transport large amounts of water and nutrients relastively large distances (microbiologically).   This allows the fungus to use the energy to attack new sites for parasitic attack or wood decay or for repid growth and enlargement of  fruitbodies.