Moulds are filamentous, multi-celled fungi with an average size larger than both bacteria and yeasts (10 X 40 µ m). Each filament is referred to as a hypha. The mass of hyphae that can quickly spread over a food substrate is called the mycelium. Moulds may reproduce either asexually or sexually, sometimes both within the same species.

Asexual Reproduction:

  • fragmentation - hyphae separate into individual cells called arthropsores
  • spore production - formed in the tip of a fruiting hyphae, called conidia, or in swollen structures called sporangium

Sexual Reproduction: sexual spores are produced by nuclear fission in times of unfavourable conditions to ensure survival.