Molds The fungal thallus consists of hyphae;a mass of hyphae is a mycelium. Aerial hyphae Vegetative hyphae Aerial hyphae Vegetative hyphae (a)Aspergillus niger (b)A.niger on agar Figure 12.2 • The fungal thallus consists of hyphae; a mass of hyphae is a mycelium. Molds Figure 12.2