"Mucor circinelloides" is one of the common species in the genus "Mucor". It is especially useful for the identification of Mucor and the causative agents of zygomycosis. In "Mucor" the product of the crgA gene acts as an activator. Extracts of "Mucor plumbeus" have shown acetylcholinesterase enzyme inhibition activity. Some "Mucor" species produce chlamydospores. "Mucor plumbeus" is distributed worldwide. Mucor hiemalis is a fungal plant pathogen. Common genera in soil are Aspergillus, Mucor, Penicillium Trichoderma, Alternaria, Rhizopus. Generally, species in the "Mucor," "Rhizopus," "Absidia", and "Cunninghamella" genera are most often implicated. Certain non-bacterial microorganisms such as "Rhizopus arrhizus" and "Mucor" may also be siderophilic. Medically relevant genera include "Mucor", "Rhizomucor", and "Rhizopus". It has also been isolated from "Mucor ramannianus" and "Isaria kogana". "Mucor mucedo" (genus species) use asexual reproduction. Among the molds commonly infecting meat are Penicillium, Mucor, Cladosporium, Alternaria, Sporotrichium and Thamnidium. Rhizomucor miehei (also&colon; "Mucor miehei" ) is a species of fungus.