What is Mucor?

Mary McMahon
Mary McMahon

Mucor is a fungal genus within the Zygomycetes class of fungi that contains an estimated 40 species. Members of the genus can be found living all over the world, in a wide variety of environments, from the forest to the carpets of homes and businesses. In Northern Europe especially, these species are ubiquitous indoors, and they can contribute to mold allergies in sensitive individuals. Some species cause diseases in humans, while others are known plant pathogens.

Mucor develops into a fluffy, white to gray colored mold.
Mucor develops into a fluffy, white to gray colored mold.

Fungi in this genus grow in the form of a white to gray mold that develops into a fluffy mass. The mold can grow on living and dead plants and in the soil. Mucor species are very aggressive, and they will quickly overrun an environment and dominate other fungi. The mold grows and spreads quickly, making it difficult for slower-growing fungi to compete. Like other members of the class Zygomycetes, these fungi can reproduce asexually with spores, or sexually by fusing to create zygospores which contain a mixture of genetic material.

Mucor often grows in carpets.
Mucor often grows in carpets.

On magnification, fungi in this genus appear in the shape of very fine threads topped with ball-shaped clusters of spores. When they dry out, the balls rupture, allowing the spores to spread through the natural environment. Spores can also be spread through running and seeping water, which is one of the reasons why these species can be such a problem in structures, as the spores will hitch a ride along leaks and seeps in walls. To eliminate the fungus, it is necessary to use soap, followed by a bleach rinse, to remove it, and to dry the environment thoroughly to inhibit the spread of spores and the growth of the mold.

Some species have been linked with allergies and mold sensitivity. In some cases, they can cause severe pulmonary distress, including difficulty breathing, and in immunocompromised individuals, the fungi can cause opportunistic infections. These occur when the spores are ingested or inhaled, and the mold can quickly spread through the body, causing a variety of health problems. Antifungal medications can be used to treat Mucor infection, although some species can be very stubborn.

Many species cannot tolerate human body temperature. Only a handful of species are heat-tolerant enough to survive in the human body, which may explain why the genus does not cause more infections. One species, M. piriformis, is famous for causing Mucor rot, a disease in plants, and several species produce enzymes that can be used in cheesemaking, illustrating the diversity of this fungal genus.

Bleach may be one of the cleaning supplies necessary to eradicate mucor.
Bleach may be one of the cleaning supplies necessary to eradicate mucor.
Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a wiseGEEK researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

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Discussion Comments


The U.S. Institute of Medicine recommends that everyone should have a mold test done on their home. Some fungi and molds can cause symptoms like runny nose, eye irritation, sore throat, cough, skin rash, and asthma.

We can't get rid of all the fungi in our houses because it's all over the place outdoors.

Water getting inside the house and hiding under a carpet and inside the walls can cause a lot of problems. Leaky pipes can also lead to mold growth.

Good idea to find the source of the water, fix the problem and do a mold test periodically.


In my nursing classes, I've been learning about so many awful diseases. It's so sad to think about all the human suffering.

This disease I just read about is called Mucormycosis. It's an infection which affects the brain, sinuses and lungs and is caused by fungus. It usually just strikes people with weak immune systems, such as AIDS, diabetes and leukemia. This shows how important it is to keep our immune systems strong.

Sometimes the disease gets so bad, doctors have to do surgery and remove the dead and infected tissue. They may have to remove the palate, and part of the nose and eyes. When I become a nurse, I hope I'm strong enough to help my patients.


I have never heard of the mucor fungus - maybe because our human body temperature is too warm. I do know that different types of fungus can cause respiratory problems for people. Black mold is something you really don't want to have in any structure that you live or spend much time in.

I have not had black mold in my house, but if we have a lot of rain, sometimes I will see spots of mold in my basement. If I spray the area with bleach it will usually take care of it.

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