Rhizomorphs are thickened mycelial strands found in some basidiomycetes and composed of outer and inner hyphae. The outer layer is usually strongly thickened, pigmented and sclerotised. Rhizomorphs resemble plant roots and also serve to transport substances. They are mainly used to reach new substrate sources, but may also transport materials to fruiting bodies at more distant locations. Rhizomorphs are well known in Armillaria, which use them not only in mycorrhizal associations but also to penetrate the root systems of host trees.

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