Photo of red mold on a building wall Red Mold spores & Yeasts in the Home
a Photo ID Library for detection and identification of allergenic, toxic, or pathogenic red molds & yeasts in buildings

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Photographs of red mold contamination & other colored molds to help identify mold contaminants in buildings.

Here we show what red mold sor yeasts look like in a home or other buildings. Photos of molds & yeasts given here show to find & recognize mold on building surfaces. What red mold and red yeasts look like growing on building indoor surfaces. Photographs of red mold & other molds of various colors and textures in buildings.

Photos of red & other colored mold contamination inside wall cavities and in insulation

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What red mold looks like in a home or other buildings

Identification Photographs of Red & Orange Molds & Yeasts in Buildings

Red mold and red yeasts can be easily seen on building surfaces, especially on the exposed or inner wall-cavity side of drywall in buildings that have been exposed to wet or flooding.

Two common indoor red or orange molds include Aspergillus versicolor and the yeast Rhodotorula. But red molds and yeasts cannot be reliably identified to genera/species without analysis by a qualified aerobiologist/microscopist in a test lab.

See Mold Atlas & Particles List for an atlas of building molds and for more microphotographs of building mold samples observed in our laboratory.

See our Atlas of Mold Related Illness Symptoms & Complaints for details about specific mold genera/species and their health effects. Also see Mold spores in the Home - a Photo ID Library for detection and identification of mold allergens on indoor building surfaces.

What does red mold or red yeast look like on indoor building surfaces? These mold spores and their photographs and examples of materials sometimes mistaken for mold have been collected in the U.S., Spain, Mexico, France, as well as in other countries where I've studied bioaerosols.

These photos of mold on indoor building surfaces may help you recognize mold in buildings, recognize probably-cosmetic mold, and recognize stuff that is not mold and does not need to be tested.


for an atlas of building molds and for more microphotographs of building mold samples observed in our laboratory, see MOLD ATLAS & PARTICLES INDEX.

moldy wall to wall carpeting - Daniel Friedman 04-11-01

Red mold (actually a yeast), orange mold, on this wall to wall carpeting surrounded by more-obvious black mold.

Watch out: black or dark colored molds may over-shadow and cause you to fail to observe red molds and yeasts in buildings or on other surfaces.

This red, orange, and tan mold was growing in spotty colonies on the grade-level floor of this building which had been exposed to high humidity.

The carpet had not been wet in this area but other building leaks were nearby. Aspergillus sp. including some strains of Aspergillus versicolor, and yeasts such as Rhodotorula were present.

Click photo for larger image.

Mold on paneling

Red and orange molds and yeasts can be hard to spot on some surfaces like this wall paneling because they are so often accompanied by other darker mold growths.

We find red molds and yeasts on the both the exposed and cavity side of drywall, on wall paneling, on building contents, on carpeting, on vinyl flooring, and on some other building materials.

We do not usually find red molds or yeasts alone, and in these photos you'll see that other mold genera/species are also present.

Wall Cavity Side of a test cut shows hidden mold

Red Mold/Yeast in a wall cavity: Red mold, such as some strains of Aspergillus versicolor, and red yeasts may form Important mold reservoirs inside building cavities. You won't see them without making a test cut in the right place. We decide where to make an invasive test cut by studying where leak or moisture problems have been or are likely to have been on a building.

This photo shows the hidden interior side of drywall on the test cut we made using the hole saw shown at the top of this page.

The red material shown on the drywall paper in this photo was a yeast which accompanied toxic mold which we confirmed was present in this wall cavity. It doesn't look like much on this little 2" round plug, but the entire wall cavity interior was contaminated with this (and other) molds and yeasts.

More red stains found indoors are discussed at STAINS on INDOOR SURFACES, PHOTO GUIDE



Continue reading at YELLOW MOLD PHOTOS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.




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