Genus of fungi of the class Zygomycetes. Occur in soil and on fruits and vegetables. Some species (e.g. Rhizopus oligosporus) are used in the preparation of ontjom, ragi, bongkrek and tempeh, while others are used in the manufacture of mycoprotein for incorporation into foods. R. stolonifer may cause spoilage of fruits, vegetables and bread, and other species may be responsible for meat spoilage.