White Mold on an interior door Pictures of White Mold in the Home
a Photo Library for detection and identification of white mold contamination in buildings

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White building mold identification photographs:

What does white mold look like on building surfaces and how hard is this mold to see? Photos of white, gray, & light-colored mold in buildings - how to find & recognize mold on building surfaces.

Photographs of light colored mold & other molds of various colors and textures in buildings. Special methods needed to spot white & light colored mold growth indoors

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Photographs to Help Identify Mold in Buildings -
What white or light colored mold looks like in a home or other buildings

White and brown basement mold (C) D FriedmanThese mold samples and 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 photos and an explanation of white fluffy stuff or white crystalline material often found on building walls, especially on masonry surfaces, but that is not mold,

Also see the white or light colored mold discussed at MILDEW in BUILDINGS ?.

A great many white and light-colored grayish molds 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.

Some of these white or very light gray molds include members of the Aspergillus or Penicillium genera as well as some basidiomycetes.

Our white building mold photo at above-left illustrates that other white molds in found in buildings may be the mycelia (think "root hairs") of many different genera/species of fungi that at their fruiting bodies will be seen in other colors and textures.

But most white building molds 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.

Identification Photographs of White & Light-Colored Mold Growth in Buildings

White mold on subflooring (C) Daniel FriedmanHere are photographs of often hard-to see white or light gray mold growth on building surfaces. At left we show white mold growth on tongue and groove subflooring in an older home in the northeastern U.S.

Light colored molds, depending on the genera species, may be more of a health risk than the infamous "toxic black mold" that people look for in buildings.

Fungal groups such as Penicillium sp. and Aspergillus sp. produce species in a wide range of colors, some of which can be quite light in color and difficult to spot on building surfaces, but these molds may produce small, easily-airborne toxic or pathogenic mold spores that present a health risk to building occupants.

White stuff that is not mold: Beware: many people mistake mineral salts or efflorescence for white mold. Efflorescence is a white crystalline salt left on masonry surfaces where water or moisture have been evaporating.

See STUFF THAT IS NOT MOLD for photos of white fluffy material or white crystalline material that is often mistaken for mold.

Below we show additional photos of white and light colored molds found in buildings.

Light colored mold on an interior door in a damp basement

The white mold growing on this basement door was hard to spot without careful use of lighting.

Be sure to review our article on How to Use Light to Find Mold in Buildings.

Example of using light to see white mold on paneling

The white mold growing on this basement stairwell paneling was impossible to see until we directed our flashlight across the surface.

White mold in an attic on the roof sheathing

Here is a photograph of white mold that was very easy to see (and possibly some light-green mold) on yellow pine tongue and groove roof sheathing visible in the attic of an older home in the Northeastern United States.

Fungus growth on resilient bathroom floor (C) D Friedman GP

White mold that turns brown: Stemonitis sp.

Here is a photograph of a white fungus found growing on resilient flooring in an Australian bathroom. This fungus was very easy to see but was for a time a bit curious.

Covered and kept moist for just a brief interval, this Stemonitis sp. matured into an easily recognizable form of brown slime mold that we illustrate and discuss at Rental Apartment Mold Safety Advice and also in more detail at BROWN HAIRY BATHROOM MOLD


Continue reading at MOLD APPEARANCE - WHAT MOLD LOOKS LIKE or select a topic from the More Reading links shown below.

Or see EFFLORESCENCE SALTS & WHITE DEPOSITS - for examples of moisture-related white deposits that are not mold.

Or see HUMIDITY CONTROL & TARGETS INDOORS for an example of white mould occurring in a U.K. home with venting & humidity questions.

Suggested citation for this web page

WHITE MOLD PHOTOS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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