12 Common Mold Types in Your Home – What You Need to Know!

In every household, the presence of mold is one of the common concerns. Even when mold isn’t visible in your living spaces, it may quietly reside in your cellar.

The most common mold types in your home

Understanding that mold can easily spread to inhabited areas, it’s crucial to remain vigilant. Being aware that your home could potentially be at risk of mold infestation, constant caution is key. This is especially important when you notice the indication of dark spots on your walls.

While not all mold types are harmful to a healthy individual, those with respiratory issues need to be cautious, as mold spores released into the air can trigger symptoms.

Mold Effects on Human Health

Removing mold from your home is essential, not only for health reasons but also for aesthetic and cleanliness purposes.

Often, mold is not just unsightly; it can also contribute to various health issues. We can categorize mold into three different types based on its impact.

Allergenic Mold

This particular type of mold predominantly affects individuals with asthma, allergies, or other respiratory conditions.

Mold, in general, has the potential to trigger such issues, categorizing all molds as allergenic. A study (according to the American College of Occupational and Environmental Medicine (ACOEM)) suggests that approximately 25% of the population exhibits mold allergies.

Nevertheless, the majority of individuals do not experience symptoms when exposed to mold spores in the air.

Pathogenic Mold

Pathogenic mold can infect and lead to severe diseases, often impacting individuals with compromised immune systems.

Vulnerable groups such as small children and older people are also at risk due to their weaker immune responses.

Toxic Mold

The source of most mold-related fears can be traced back to toxic molds. 

While they are rarely encountered in homes, their potential danger warrants constant vigilance. Toxic molds release mycotoxins, some of the most hazardous chemicals known to humanity. These toxins pose a threat not only to people but also to all living organisms on Earth. Mycotoxins are present on both the mold and its spores, emphasizing the need for immediate evacuation from a room containing toxic mold. Even with protective measures like a gas mask, direct contact with the mold can yield similarly dire consequences. Given the extreme danger and high toxicity levels involved, it is advisable to entrust toxic mold removal to professional experts.

Our planet boasts over 100,000 mold species, the majority of which are harmless. However, a small fraction is so dangerous that it could potentially be used as a bioweapon. Determining the specific mold type in your environment necessitates conducting a mold test, as appearances alone can be deceiving.

The Most Common Household Mold Types

Only a small fraction of over 100,000 mold species, around a dozen, are typically located in homes. However, it’s crucial to understand that these familiar molds don’t exclude the possibility of some of the other 100,000 mold species being found in a house.

The possibility of various molds taking up residence depends on factors like the type of house, available light sources, sources of moisture, and other conditions that some molds require for growth.

12 Types of Mold Found in Home

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Alternaria, a prevalent household mold, typically causes allergic reactions in most examples. However, exposure to Alternaria spores can, in some cases, worsen or even trigger asthma. Beyond its allergenic properties, Alternaria is also a pathogenic mold. 

This means that individuals with weakened immune systems, including older adults, infants, and AIDS patients, are susceptible to infections caused by Alternaria. Within the genus, Alternaria boasts 299 species, and it’s important to note that not all of them are pathogenic.

Identifying Alternaria is often possible by its distinctive fluffy texture, which ranges in color from dark green to brown. It’s worth mentioning that certain species of Alternaria are capable of releasing mycotoxins, rendering the mold potentially toxic under specific circumstances.


Aspergillus ranks among the most frequently encountered molds in homes. This mold contains several hundred subspecies, with some of them possessing the capability to produce mycotoxins, which are perilous to both animals and humans. Even the common strains of Aspergillus that do not produce mycotoxins can still pose respiratory challenges for individuals with preexisting breathing issues. Nevertheless, healthy individuals typically don’t experience problems due to this mold.

Aspergillus shows a penchant for carbon, sugar, and salt, making it commonly found on items such as bread or other food-rich sources. Interestingly, some varieties of Aspergillus can also thrive on low-carbon sources, like damp walls.


Aureobasidium, a yeast-like fungus, predominantly appears in a black hue and can be commonly found in soil, water, and the air. Interestingly, when it colonizes potatoes, it takes on a pinkish hue unless the colony ages and reverts to its original black color. 

While Aureobasidium isn’t considered dangerous, individuals with respiratory issues should exercise caution when exposed to its spores for extended periods, as this exposure can potentially lead to acute problems.


Bipolaris, a swiftly proliferating mold, is commonly discovered on grass, house plants, and soil covered with plants. It can also thrive on spoiled vegetables. The coloration of Bipolaris varies, starting as white in the early stages of colony growth and eventually turning black as the colony ages. 

Similar to many prevalent molds, Bipolaris has the potential to affect your respiratory system. Symptoms such as a stuffy or runny nose, sinus issues, and coughing may manifest due to exposure to Bipolaris mold.


Chaetomium, a dark-colored mold, is frequently encountered on walls but can also be present in soil, air, and plants. The Chaetomium genus encompasses approximately 95 species, all of which are generally common and pose minimal risk to people. 

However, individuals with weakened immune systems may be susceptible to infections if they inhale Chaetomium spores. Additionally, sensitive individuals can experience allergic reactions when exposed to this mold.


Cladosporium, one of the most extensive fungal genera boasting over 700 species, is prevalent both outdoors and indoors. In outdoor environments, this mold thrives on plants, utilizing them as a source of nourishment for growth and propagation. Indoors, Cladosporium can take root on wet surfaces or spoiled food. 

Generally, Cladosporium is considered a non-threatening mold and is often non-pathogenic to humans. It does not produce mycotoxins, which are harmful substances. However, in certain instances, it may release Volatile Organic Compounds (VOCs) that can contribute to unpleasant odors.


Fusarium is a mold of particular interest, primarily considered harmless in the majority of cases. However, it’s worth noting that certain Fusarium species have the potential to release mycotoxins, which can then pose a risk to both humans and animals. The remaining Fusarium species are generally not dangerous, although individuals with weakened immune systems may experience mild symptoms when exposed. 

Interestingly, Fusarium also plays a unique role in food production as it is utilized in the creation of meat substitutes like Quorn. Quorn is a delectable food option cherished by vegans and vegetarians, as it offers a rich source of proteins derived from Fusarium.


Penicillium is arguably one of the most renowned fungi, honored for its pivotal role in the creation of antibiotics. Nevertheless, it is no secret that some individuals are allergic to penicillin, rendering them unable to use antibiotics derived from Penicillium fungi. Conversely, certain Penicillium species play a crucial role in daily cheese production, contributing to the delicious flavors and textures of various cheese varieties. 

However, it’s essential to acknowledge that there exists a darker side to Penicillium as well, as some species have the capability to release mycotoxins, underscoring the duality of this fungal genus.

Stachybotrys Chartarum

Stachybotrys chartarum is also called black mold or toxic black mold, which is one of the most dangerous molds you can have in the house. Black mold likes soil and grain, but it is mostly found in old damp buildings with cellulose-rich material. The good news is that even if you do get infected by black mold, not all of it releases mycotoxins, and mold, over time, loses the power to release mycotoxins. 

Nonetheless, you should immediately appoint a professional mold removal company if you are infected with black mold. 

Serpula Lacrymans

Serpula lacrymans is a distinctive fungus that thrives on dry wood, and its presence can lead to rapid wood decay, posing a significant threat to the structural integrity of buildings, especially if the foundation relies on wood. In addition to causing wood deterioration, Serpula Lacrymans also releases mold spores, potentially categorizing it as an allergenic mold. 

However, research on mycotoxin release by this fungus is limited, and it remains uncertain whether some species are capable of producing mycotoxins. Further investigation is needed to fully understand the potential health risks associated with Serpula Lacrymans.


Trichoderma colonies are predominantly located on wood, although they can also be found in soil. While this mold is commonly encountered in outdoor natural environments, it is not unusual to find it within homes, especially those constructed with wooden components. In indoor settings, Trichoderma has the potential to be toxic as it produces small toxic peptides. 

Interestingly, Trichoderma also has applications in the medical field, where it is used in immunosuppressant medications designed to prevent organ transplant rejection, highlighting the multifaceted nature of this mold.


Ulocladium is commonly encountered on spoiled food or plants, although it can also thrive in moist areas within homes, potentially contaminating other food sources. 

This mold emits airborne spores that have the potential to induce respiratory issues, particularly affecting individuals with weakened immune systems due to the pathogenic nature of certain Ulocladium species. Ulocladium is typically identifiable by its brown, black, or grey coloration and its cotton-like texture.

Final Thoughts

The details shared above emphasize that most of the mold species listed carry inherent risks to human health

Since all mold types release spores, they can pose challenges, particularly for individuals with respiratory conditions. 

Some molds, however, present an exceptionally high level of danger, making it imperative to engage professional assistance when dealing with their removal from the home. Taking swift action to address these molds is essential for ensuring a safe and healthy indoor environment.

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