No, a mushroom is not abiotic; it is biotic.
To explain further, abiotic factors refer to non-living components of an ecosystem, such as water, sunlight, temperature, and minerals. On the other hand, biotic factors are the living components, which include plants, animals, fungi, and microorganisms.
Mushrooms are the reproductive structures of fungi, which are living organisms that play various roles in ecosystems, including decomposition and nutrient recycling. They grow from mycelium, a network of fungal filaments that spread through soil or decaying matter. Since mushrooms are alive, they are classified as biotic, not abiotic.