The Most Common Forms of Indoor Mold and What They Do

Indoor MoldMold, while comprised of microscopic organisms, is one of the largest threats inside of American homes. All forms of mold should be dealt with as soon as possible to prevent overgrowth and structural damage. However, one of the most common concerns we receive from our clients is if the growth is hazardous. Toxic mold is a very serious problem and makes the remediation need even more urgent. If you’re not sure whether the mold in the house is harmful, you may find this guide to the most common forms of indoor mold handy!

Have you noticed indoor mold in the house? Rely on ServiceMaster of Charleston for professional, timely, and quality mold remediation and testing service!

4 of the Most Common Indoor Molds


Commonly found in kitchens and bathrooms, cladosporium is one of nature’s most widespread molds. Around 40 species of cladosporium are naturally found in soil or decaying plant material but can easily transfer indoors based on the growth sources it can find. In the indoor environment, cladosporium thrives on wet building materials such as painted walls, wood, wallpaper, and gypsum board. It is known for causing asthma attacks, so this is a form of mold you’ll want to deal with if you or anyone in your family suffers from allergies.


Aspergillus is a very dangerous mold with close to 200 varieties, including the infamous black mold. It produces toxic compounds that are easily inhaled. If too many of these spores are ingested, it can cause serious health issues including malt worker’s lung. Inside the home, aspergillus mold is most commonly found in damp walls, wallpaper, carpets, and upholstered furniture.


If you find mold forming around your wet window frames, carpet, or damp walls, it’s most likely aurei basidium. It is a spoilage organism and a deteriogenic agent of painted surfaces. You may also find it in stored food such as wheat, barley, oats, and meat. No worries! This form of mold is considered harmless to humans.


These darkly pigmented fungi are commonly found in soil and decaying herbaceous plants in the outdoor environment. Inside your home, ulocladium can be found on wet walls and particle board. Since it requires a high amount of moisture to grow, the presence of ulocladium is usually a good indicator of water damage. One interesting feature of this mold is that it doesn’t like to grow alone. In fact, it is usually found alongside other molds like stachybotrys, fusarium, and chaetomium. However, that does not mean it isn’t hazardous. Ulocladium can sometimes cause hay fever-like allergies and deep skin infections.

For tips on how to get rid of mold naturally, read our blog for a nearly endless amount of tips and suggestions!

ServiceMaster of Charleston is Here to Help

While some forms of mold can be taken care of on your own, we always recommend calling a professional when any signs of mold are present. We will help you identify the mold, where it is coming from, and react quickly to provide you with quality mold removal results. We’ll restore your peace of mind and have your home right back to normal as soon as possible! Contact us today and inquire about our mold remediation and testing services. We’re happy to help!