What is a fungal hypha?

A fungal hypha is a long, branching filament that makes up the structure of a fungus. Hyphae are typically microscopic and can be either septate, containing cross-walls, or coenocytic, lacking these divisions. They grow and spread out to absorb nutrients from the environment, forming a network called mycelium, which is crucial for the fungus's growth and reproduction. Hyphae play a key role in decomposition and nutrient cycling in ecosystems.