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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.
Fungal Hyphae A single fungal filament is called a hypha (plural hyphae). The chitin cell wall encloses a cytoplasm that may be undivided (Zygomycetes-molds), partially divided by perforated cross-walls (Ascomycetes-morels, cup fungi, blue molds) or fully divided (Basidiomycetes-mushrooms).hey have a cell wall of chitin rather than cellulose. The cell structures are similar to plants in that they have vacuoles, mitochondria, ribosomes, etc. At certain times of the life cycle, fungal cells become dikaryotic with two nuclei resulting from the fusion of two different strains of hyphae.