Chaetomium: The Other Black Mold

Black Mold Symptoms: Chaetomium
Usually when you hear the terms “Toxic Black Mold” the mold being referred to is Stachybotrys.  However, what people may not know is that there are a lot of different types of mold that appear black in color.
Here are a few:
  • Aspergillus niger
  • Chaetomium
  • Nigrospora
  • Stachybotrys
  • Auerobasidium
  • Alternaria

As expected Black Mold Symptoms vary for each mold type.  For this blog post we are limiting our discussion to Chaetomium .  Chaetomium is a demataceous mold, meaning its spore is darkly pigmented,  with roughly 80 known reported species.

One species is Chaetomium globosum, and is frequently found in water damaged builings.  Thriving under the same environmental conditions that Stachybotrys does, both types are routinely discovered growing in the same location.

Now on to the health effects.  OSHA lists 4 species of Chaetomium in their 1994 report (3) under the heading:


  • Chaetomium globosum
  • Chaetomium piluliferum
  • Chaetomium reflexum
  • Chaetomium thermophilum

Another source,  “the website ( describes C.globosum as allergenic and an agent of onychomycoses (nasal infection), peritonitis, cutaneous lesions and potential agent in fatal systemic mycoses.  It is also says “No toxic diseases have been documented to date”(1)

We also came across recent research study Isolation, purification and characterization of proteins from indoor strains of Chaetomium globosum that are antigenic to humans by Provost, Natacha B., M.Sc 2010 the abstract reads:

 “Chaetomium globosum grows on damp cellulosic materials indoors and can adversely affect human health through allergic and toxic reactions. To study allergic response, exposure assessments must be done by measuring human allergens or antigens. The goal of this research was to identify C. globosum proteins that are antigenic to humans” (4). to read complete paper or order a copy please see resource link (4) below.

Black Mold such as Chaetomium is easily identified by a direct examination under the microscope.

Black Mold: Chaetomium
If you discover house mold in your apartment or home and want to find out what type you are up against, you can get a sample tested for only $35.  Watch this short video for step by step instructions DIY mold testing video .

Another related blog post you might be interested in is:  Aspergillus niger and Garlic

 Helpful resources:

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