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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.
This is named after the pin-like structures (sporangia) which project upwards, containing spores. If such a fungus spore lands on a suitable substrate (i.e. material capable of providing support and nutrition), it may germinate and produce a few filamentous strands (about 10 Âµm in diameter) called hyphae (singular - hypha) which are the feeding parts of the fungus, and they branch repeatedly.