The role of mycelium in fungi is essential for nutrient absorption and environmental interaction. Mycelium consists of a network of thread-like structures called hyphae, which extend through the soil or organic matter. This structure facilitates the decomposition of organic materials, allowing fungi to break down complex compounds and obtain nutrients. Additionally, mycelium forms symbiotic relationships with plants through mycorrhizae, enhancing nutrient exchange and supporting ecosystem health. Overall, mycelium plays a crucial role in nutrient cycling and maintaining soil fertility.