Oxygen is required for "Rhizopus" spp. The fruits are subject to damage from gray mold, rhizopus rot, and leather rot. Narnaviruses have been shown to be required for sexual reproduction of "Rhizopus microsporus". It is different from the Rhizopus strains used in Huangjiu. A popular Indonesian food, tempeh, is created by fermenting soybeans in combination with "Rhizopus oligosporus". Okara can be used to make tempeh, by fermenting with the fungus "Rhizopus oligosporus". "Rhizopus oryzae" has variable sporangiosphores. Like other members of the genus "Rhizopus", "R. stolonifer" grows rapidly, mostly in indoor environments. Medically relevant genera include "Mucor", "Rhizomucor", and "Rhizopus". The family is lost in most fungi (except Rhizopus) and plants. Generally, species in the "Mucor," "Rhizopus," "Absidia", and "Cunninghamella" genera are most often implicated. Rhizopus stolonifer is commonly known as black bread mold. "Rhizopus stolonifer" is a worldwide distributed species. "Rhizopus stolonifer" can reproduce asexually and sexually. They can be distinguishable from "Rhizopus stolonifer" as they have smaller sporangia and spores.