Is mycelium a symptom or sign ?

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Mycelium can be considered more of a sign than a symptom. In biological and ecological contexts, "signs" refer to observable phenomena, while "symptoms" typically refer to indicators of disease or distress in organisms. Mycelium is the vegetative part of fungi, consisting of a network of fine white filaments (hyphae). Its presence indicates that fungi are growing and functioning in an environment, but it does not indicate a disease state like symptoms would in animals or plants. Instead, it serves as a marker of fungal activity and health in an ecosystem.