Which part of the mycelium extends above the substrate and may bear spores?

• A. Vegetative mycelium
• B. Aerial mycelium
• C. Rhizomorphs
• D. Hyphae

Answer: (B)

The part that extends above the substrate and may bear spores is the aerial mycelium. This portion grows into the air and often carries the spore-producing structures that enable dispersal, such as conidiophores or basidia. The vegetative mycelium stays within the substrate to absorb nutrients, which is why it isn’t usually involved in spore production. Rhizomorphs are thick, root-like cords used for nutrient transport and exploration, not primarily for spore formation. Hyphae are the individual filaments making up the mycelium, but they include both aerial and vegetative forms; the term here specifically points to the aerial, spore-bearing portion.