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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.
DISCUSSION. Molds are multinucleated, filamentous fungi composed of hyphae. A hypha is a branching, tubular structure from 2-10 &#181m in diameter and is usually divided into cell-like units by crosswalls called septa. The total mass of hyphae is termed a mycelium.