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What is Green Mold?
Oct 19, 2017

Green mold is an umbrella term that refers to a number of species of fungus with spores that take on a green tint. The more common species usually belong to three genuses of fungi: CladosporiumAspergillus and Penicillium. There are health hazards associated with the spread of green mold in areas frequented by people, and much like other mold variants, if the mold manages to penetrate households and hidden spaces, it can be difficult to remove it completely. Some mold species are relatively benign when exposed to people, while other species can cause more serious health problems that range from infections to extreme allergic reactions and toxic poisoning.

In broader terms molds are microscopic fungi that sustain themselves on many different surfaces all over the environment. Molds spread by producing tiny spores that can infiltrate almost any space, from where they reproduce and spread under the right conditions. These spores determine what color the particular mold species will assume. Not all fungi species that are classified under CladosporiumAspergillus or Penicillium will manifest as shades of green as species can differ from each other in color and scope of their effect.

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Fungi species of the genus Cladosporium are very common molds that can be found in both enclosed areas and outdoors. Cladosporium species that appear as green mold are usually olive green in color. They thrive on plants in particular, and their spores are significantly present in the air. If Cladosporium manages to enter a household, it can usually be found on surfaces such as walls, insulation and wood framing but mostly in areas prone to constant moisture. Health concerns related to Cladosporium usually concerns its allergenic properties, as an abundant presence of spores could trigger symptoms in people with asthma or respiratory problems.

Species classified under the Aspergillus genus also produce common varieties of green mold. These green mold species prefer highly oxygenated environments and are a common cause of food spoilage. They prefer to grow on bread and other starchy foods, but they also have the ability to grow in areas that are depleted or completely deprived of nutrients, as is the case for the Aspergillus mold known as mildew.

Aspergillus will spread indoors, especially in moisture rich areas, and can pose a significant threat to a person's health, as some species of can be allergenic and pathogenic. Aspergillus flavus is one toxic mold species that possesses pathogenic properties. It can produce specific toxin called alflatoxin that is highly carcinogenic.

Penicillium species are well known for producing the antibiotic penicillin, a medically valuable compound that can eliminate some bacterial infections. The spores of Penicillium are some of the most common green mold species. They have a preference for cool, moderate environments, such as soil. Like Aspergillus, green mold species of the Penicillium genus can also contaminate food supplies. While some species produce the highly beneficial penicillin, other types can emit mycotoxins, toxins specific to fungi, the effects of which can cause significant harm on exposure.


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