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Conidia on conidiophores. A hypha (plural hyphae, from Greek á½ÏÎ®, huphá¸, âwebâ) is a long, branching filamentous structure of a fungus, oomycete, or actinobacterium. In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium. Yeasts are unicellular fungi that do not grow as hyphae.
1 The cell walls are made of polysaccharide (chitin or cellulose). 2  When a mass of hyphae are visible, it is called mycelium.  1. Vegetative hyphae: these procure nutrients by secreting enzymes into the substrate (food source) which catabolize (break down) the nutrients, which are then sucked up through the hyphae. The vegetative hyphae also serve as an anchor on which they are growing.