Hyphae are the underground structure of the fungi. The mycelium consists of a network of hyphae. The hyphae absorb nutrients from the soil and are used for propagation by forming fruiting bodies.
Sources
Study.com – Hyphae in Fungi – Definition, Function & Types 
Natur & Kultur – Unusual Edible Mushrooms by Oliver Karlöf
April 2023, TÄNKOM | Revised February 2024 RETHINK
