This zygomycete fungus is commonly found indoors and may cause mucorosis in people with compromised immune systems. Sites of infection include the lungs, nasal sinuses, brain, eyes and skin.

Also known as Cephalosporium sp., this fungus can produce mycetomas, infections of the nails, onchyomycosis, corneal ulcers, eumycotic mycetoma, endophthalmitis, meningitis, and endocarditis.

A major cause of mold allergies. Alternaria is commonly found outdoors in soil, sewage, vegetation, and food debris. Indoors, it usually grows on wallpaper or in carpets or textiles. It's most prevalent in the fall and may activate hay fever, asthma, or Woodworkers lung.

One species is reported to be an allergen. It's often found on dead plants and in soil, but rarely indoors.Considered an allergen.

Of the 187 different varieties of this mold, 20 are known to cause fungal infections which can lead to allergic-related diseases and even permanent lung damage.

A non-toxic mold not commonly found indoors.

Found in warm soil, dairy products, moldy corn and peanuts, and water damaged carpets. Isolated from plants and soil. This mold is poisonous when ingested and can lead to pulmonary, systemic, sinus, ear, and other infections.

One of the most common causes of Aspergillosis in humans, especially those who are immune-compromised, and a frequent agent of sinusitis. It's often found in house dust worldwide.

This common outdoor fungus grows in the winter. It's rarely involved in nail, ear, and systemic disease.

Found in warm soils and slowly decaying plants, this mold can produce toxins that lead to diseases of the lungs.

This mold has a musty odor, hence its nickname as the onion mold. It's frequently found in house dust and can lead to fungal related ear infections.

Found in warmer soil, grains, straw and cotton, this mold has been linked to nail, skin, eye, ear, and systemic infections.

Growth of this organism indicates moisture problems in the house such as water damaged building materials. It produces the toxin sterigmatocystin which occasionally leads to nail or invasive infections.

Found everywhere in nature and often in damp indoor materials. They are an allergen, but not toxic to people.

This yeast-like fungus often grows on the silicone caulk used in bathrooms and kitchens, on damp window frames, and in shower tracks. It starts out as a pale pink growth maturing to black, though it is not the feared toxic black mold. Aureobasidium rarely causes infections, but it can be allergenic. Cases have been reported of corneal, peritoneal, cutaneous, pulmonary, and systemic infections.

These fungal spores are from mushrooms. They are rarely allergenic but if ingested, can be toxic.

Commonly considered a contaminant, but very rarely involved in the infection of humans. This mold can be a cause of hay fever and asthma. No toxic diseases have been documented to date.

A widespread fungus that grows indoors and out. It's associated with grass, plants, decaying food, and soil. It can produce the mycotoxin, sterigmatocystin, which has been shown to produce liver and kidney damage when ingested by laboratory animals. It also causes allergic sinusitis in people with compromised immune systems, which may progress to invade bone and cause lesions in the brain. Occasionally it infects other sites such as the eye, skin, aorta, lung, and central nervous system.

Found growing on plants, in oil, soft fruits, and vegetables. Some people experience hay fever, asthma or Winegrower's Lung from Botrytis, but no toxic or invasive diseases have been documented to date. It's commonly considered a contaminant.

Grows outdoors on soil or plant debris. It's commonly considered a contaminant, and only occasionally allergenic.

This widespread mold is common in soil and on plants. It's considered a contaminant.

The most commonly identified outdoor fungus, found in soil, and decaying plants mostly in the summer. Inside, it grows on textiles, wood, tile grout, and bathrooms where humidity is above 50%. Cladosporium commonly causes extrinsic asthma.
 Certain strains are considered toxic.

Considered a contaminant, this mold can cause pulmonary infections in people with compromised immune systems.

A common mold that grows in soil, plants and a variety of building materials. It's known to cause hay fever, asthma, and allergic fungal sinusitis. In those with compromised immune systems, it can cause corneal infections and mycetoma.

Found on grasses, grains and decaying food, it can occasionally cause corneal infections of the eye.

This common allergen is found in plants, soil, grains, textiles, and paper products. No cases of infection have been reported in people.

These common plant pathogens cause powdery mildews. Erysiphe feeds on leaves, stems, flowers, and fruits of living higher plants. No health or toxicity information is available.

This black yeast can lead to occasional mycetomas, chromoblastomycosis, and other subcutaneous lesions.

An emerging pathogen, this mold can cause phaeohyphomycosis, most commonly in nasal sinuses, skin, subcutaneous tissue, and cornea. Rare, but fatal infections have been reported. See Bipolaris sp.

Commonly causes skin lesions and more rarely, internal infections.

Found on plants and in humidifiers. Can produce trichothecene toxins that target the circulatory, alimentary, skin, and nervous systems. Frequently involved in eye, skin, and nail infections.

A common contaminant of grains, fruits, dairy products, paper, textiles, soil and water, and often present as part of the normal human flora. One species can cause a secondary infection associated with tuberculosis.

This common mold is closely related to Penicillium and Paecilomyces. It's reported to be allergenic. No cases of infection have been reported.

Considered a contaminant, this mold is not known to cause infection.

Causes ringworm and other skin infections. It usually does not invade living tissue. It colonizes the outermost layer.

This fungus produces soft rot of tree fruits and red bread mold. It's considered a contaminant and rarely causes corneal eye infections.

Occasionally found indoors, but usually in decaying logs, stumps and dead leaves. There are no reports of human infection, but myxomycetes have been linked to hay fever and asthma.

This fungus grows quickly in soil, dead plants, horse dung, fruits, leather, meat, dairy products, animal hair, and jute. Rare infections in severely debilitated patients have occurred (Mucorosis).

Found growing outside in soil and decaying plants. Some people experience hay fever and asthma with this mold.

Considered a contaminant, this mold results from unfavorable growth conditions and can be allergenic. Other common names include hyaline mycelia and mycelia sterilia.

This contaminant has been linked to deep infections in people with compromised immune systems. The species P. variotti can cause paecilomycosis, which can cause Wood-Trimmers Disease and humidifier associated illness. If growing on an arsenic substrate, i.e. wallpapers covered with paris green, it can produce arsine gas.

This common mold grows outdoors in soil, food, cellulose, and grains, and indoors often in musty basements. It can cause extrinsic asthma and mucorosis in people who are already ill.

Commonly considered a contaminant. Pithomyces grows on dead grass in pastures and causes facial eczema in certain animals.

May cause mucorosis in immune compromised individuals and is often linked to occupational allergies. Sites of infection include the lung, nasal sinus, brain, eye, and skin.

Frequently found in house dust, soil, fruits, nuts, and seeds. It is also often found in forgotten leftover food. Exposure to large numbers of these spores has been reported to cause respiratory problems. Those with diabetic ketoacidosis, malnutrition, severe burns, or other immune compromising situations are most likely to be affected.

An allergenic reddish yeast found in most environments such as carpeting, cooling coils, and drain pans. It has shown up in positive skin tests and in terminally ill patients.

Often grows on grasses, flowers, plants, and trees, but rarely indoors. It can cause hay fever and asthma, but hasn't been known to cause infections.

May produce arsine gas if growing on arsenic substrate. This can occur on wallpapers covered with paris green. It has been found growing on a wide variety of materials including house dust. It is associated with type III allergies.

Known to cause nail and skin infections. There are also rare reports of more deep-seated infections, i.e., sinusitis and fungemia in people with lowered immune systems. People are usually infected in tropical or subtropical areas.

Cause of Dry Rot and extrinsic asthma. Acute symptoms include edema and brochiospasms. Chronic cases may develop pulmonary emphysema.

Smuts do not usually grow indoors. They are found outside growing on living plants. There are no reports of human infection by the plant parasitic forms.

Commonly considered a contaminant. This type does not cause sporotrichosis.

The infamous "black toxic mold." Several strains of this fungus may produce a toxin that's poisonous by inhalation. This slow-growing, dark-colored fungus grows on building material with high-cellulose content and low-nitrogen content such as wallboard, jute, wicker, and straw. Areas with humidity above 55% where temperature fluctuates are ideal for toxin production. People with chronic exposure to the toxin produced by this fungus have reported cold and flu symptoms, sore throats, diarrhea, headaches, fatigue, dermatitis, intermittent local hair loss, and generalized malaise. The toxins produced by this fungus will suppress the immune system affecting the lymphoid tissue and the bone marrow. Animals injected with the toxin from this fungus exhibited the following symptoms, necrosis and hemorrhage within the brain, thymus, spleen, intestine, lung, heart, lymph node, liver, and kidney. Affects by absorption of the toxin in the human lung are known as pneumomycosis.

An allergenic contaminant found in soil, wood and decaying vegetation, but rarely indoors.

Grows outdoors in soil, wood, oats, and vegetation. Indoors, it grows on cellulose-containing materials such as jute or paper. It can lead to symptoms of hay fever and asthma.

Commonly found in soil, dead tree, pine needles, paper, and unglazed ceramics. It will often grow on other fungi and produce antibiotics which are toxic to humans.

This allergen can cause ring worm, athlete's foot, skin, nail, beard, and scalp infections. It can be found on soil and skin.

This contaminant requires a lot of moisture to grow. It's found on plant material, soil, textiles, fibers, wood, paper, paint, tapestries, wet wall board, and particle board. It's a major hay fever and asthma allergen but rarely causes infections.

Commonly known as a contaminant.Verticillium is found in decaying vegetation, on straw, soil, and arthropods. It rarely causes inflammation of the cornea.

Found in sugary foods, salted meats, dairy products, textiles, soil, hay, and fruits. This fungi attacks materials with low water activity.

Some yeasts are reported to be allergenic. Health problems can occur with frequent exposure, causing hypersensitivity.