Class of rapidly growing molds with broad, sparsely septate hyphae and asexual spores borne in globose sporangia on stalks. Includes Rhizopus and Mucor, which are central to traditional fermentations (tempeh, ragi, sufu) and are also common spoilage organisms and fast-growing contaminants of grain spawn.

Characteristics: Fast-growing, cottony aerial mycelium; sporangia on sporangiophores; stolons and rhizoids in Rhizopus; zygospores.