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10 Facts About Stachybotrys from Eurofins CEI

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Black Mold on window

Learn ten interesting facts about the fungus that has been sensationalized by the media.

1. “Toxic black mold” refers to Stachybotrys chartarum (or Stachybotrys atra).

2. There are other molds besides Stachybotrys that are black in color.

3. Stachybotrys spores can generate mycotoxins, which are potentially dangerous if inhaled or ingested.

4. The spores do not always produce mycotoxins; certain favorable conditions must be present.


Penicillium, Stachybotrys' more helpful cousin.

5. Stachybotrys isn’t the only type of mold that can produce mycotoxins; there are also species of Alternaria, Aspergillus, and Penicillium that produce them as well (just to name a few).

6. Stachybotrys can be found growing on a variety of household materials but is most commonly found on cellulose-rich products such as drywall. (Best to have it tested to make sure.)

7. Stachybotrys is considered a “long-term” water damage indicator; usually not growing until after 1-2 weeks of exposure to moisture.

8. Spores can remain dormant for many years and may revive upon re-introduction to a water source.

9. Stachybotrys spores are held together by a sticky, filmy coating. If the spores dry out or are disturbed, they can be released into the air readily. 

10. These spores can also be found growing outdoors, especially on straw.

Eurofins CEI has been providing microbiology testing for mold and other indoor air quality (IAQ) parameters since 2001. Eurofins CEI is AIHA-LAP, LLC accredited for environmental microbiology for the direct examination of fungi for air and bulk. Our laboratory staff includes experienced microbiologists and a CIH Lab Director available to answer questions and interpret laboratory results.

Don't guess when it comes to dangerous mold in your home – contact Eurofins CEI today!

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