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Hyphae is plural for the word hypha. Hyphae are the filaments of  the branches of the mycelium or vegetative part of a fungus.
Very few fungi exhibit dimorphism. Most fungi occur in the hyphae form as branching, threadlike tubular filaments. These filamentous structures either lack cross walls (coenocytic) or have cross walls (septate) depending on the species. In some cases septate hyphae develop clamp connections at the septa which connect the hyphal elements.