Mold Library

Complete Mold Library - Common Mold Species


There are many different types of mold species on this Earth—some toxic, others harmless. At Mold Busters, we believe that important mold-related information should be readily available to and easily accessible by the public.

Our mycology team has created a database of the most common species of mold found indoors so that residents of Ottawa, Montreal and surrounding areas can learn about various molds—what they look like, where they grow and how hazardous they are to human health.

Access to the mold library is FREE and extremely valuable. For more information about any of the molds listed in the library, call us and talk to a mold expert.


Absidia is definitely a mold to look out for, as it combines two properties that make it a serious threat to humans – it grows indoors and is a human pathogen.

Acremonium is a group of molds that can frequently be found indoors and several of its species are known human pathogens.

Acremonium strictum is a common species, isolated mainly from soil and plants as well as indoor environments.

Aleuria aurantia is a widespread fungus belonging division Ascomycota, class Pezizomycetes, order Pezizales, family Pyronemataceae.

With over 250 known species , Alternaria molds are extremely common and widespread.

Alternaria alternata belongs to the section Alternata within the genus Alternaria, family Pleosporaceae, and phylum Ascomycota.

Arthrinium is a fungal genus that belongs to the family Apiosporaceae.

Ascospores are microscopic spores produced by fungal species belonging to the Ascomycota.

Aspergillus is a diverse fungal genus with high economic and health impacts.

This fungal species was first described by French botanist Georges Bainier in 1916. It belongs to the Aspergillus genus of the Trichocomaceae family.

Aspergillus clavatus is a species of fungus that is widespread and can frequently be found growing in soil and animal manure. It is also common in cereal-based foods.

A. flavus is the second most common species to be identified in human infection, besides A. fumigatus. In nature, it is usually found growing in soil as well as dead plants and animals.

Aspergillus fumigatus is a species of fungus that causes a wide range of diseases in human beings. It is a spore-forming mold that readily grows in nature and infects a wide range of animal and plant species.

Aspergillus nidulans is a member of the genus Aspergillus, family Trichocomaceae, positioned in the Ascomycota phylum.

Aspergillus niger is a type of mold and the most common fungus in the Aspergillus genus.

Aspergillus ochraceus is a species of mold that is frequently found in grains, soil, and dried food products. This species produces ochratoxin A (OTA), a potent mycotoxin that can cause serious kidney damage.

Aspergillus oryzae is an aerobic filamentous fungus of the genus Aspergillus.

Aspergillus penicillioides was originally described by Spegazzini in 1896, and the species is reproducing strictly asexually via conidia.

Aspergillus restrictus is a mold fungus belonging to the section Restricti of the Aspergillus genus.

Aspergillus sclerotiorum is a filamentous, asexual fungus belonging to the genus Aspergillus section circumdati.

Aspergillus sydowii is a species of fungus first described by French botanist and mycologist Georges Bainer in 1923. In nature, it is typically found in soil, on seeds and on decomposing organic matter.

Aspergillus terreus is a filamentous fungus belonging to the Aspergillus section Terrei.

Aspergillus unguis is a cosmopolitan saprophytic mold species , and it is the asexual state of the Emericella unguis.

Aspergillus ustus is one of the most ubiquitous soil-borne Aspergillus species.

Aspergillus versicolor is commonly found in soil and decaying organic matter, and has been known to develop on many kinds of food, including cereal grains, seeds, nuts, dried meats and dairy products.

The Aureobasidium genus comprises of over 15 species or varieties. The taxonomy of the Aureobasidium genus is still an area of dispute, with species often being reclassified as varieties and vice versa.

Aureobasidium pullulans belongs to the diverse group of mold fungi known as black yeasts. The name comes from a layer of black spores, which envelop the colonies of this mold.

Basidiospores develop into many sorts of commonly found mold. These molds are identifiable by their MVOC (Microbial Volatile Organic Compounds) releases that have a unique musty and condensed smell.

Beauveria is a genus of entomopathogenic fungi. They are parasites of insects and other arthropods.

Bipolaris molds are plant parasites that are majorly found in plant debris, soil, and other plant materials. They are commonly associated several crop diseases, such as leaf spots, leaf blights, melting outs, root rots and foot rots.

The most common species of Botrytis, B.cinerea, is commonly referred to as gray mold. It first attacks a plant in the form of a white growth which over time develops into a gray mass with a velvety appearance.

The only known vascular wilt disease of wheats and grasses is known as Cephalosporium stripe, and is caused by the fungal pathogen Cephalosporium gramineum.

Cercospora sp. are fungal plant pathogens that cause Cercospora leaf spot (CLS) disease. The genus is abundant and they infect all types of plants.

Chaetomium molds are commonly found in soil, air, dung, and plant debris. The colonies are initially cottony and white in colour but turn greyish-green as they mature. They grow quickly, feeding off of any materials that contain cellulose such as paper, fabrics and drywall.

Chaetomium globosum is the most commonly found species of the genus Chaetomium, which belongs to the family Chaetomiaceae, order Sordiales, and division of Ascomycota.

Chrysosporium is a genus belonging to the phylum Ascomycota within the kingdom of Fungi.

Cladosporium is a common genus of fungi which can be found indoors and outdoors, growing on soil, moist surfaces or decaying organic matter.

Cladosporium cladosporioides can cause human mycotic infections, although very rare and predominantly concerning superficial infection cases.

Cladosporium herbarum is a mold belonging to the genus Cladosporium, and it is one of the most commonly found fungi, both indoors and outdoors.

Cladosporium sphaerospermum is a common airborne and cosmopolitan mold species.

One of the most unwanted and economically most significant phytopathogenic fungi is Claviceps purpurea, commonly known as rye ergot fungus.

Coelomycetes are an artificially made group of conidial fungi which include species from Ascomycota and Basidiomycota phyla.

Cryptococcus is a fungus which causes cryptococcosis, especially in individuals with suppressed immune systems. It comes in sexual and asexual forms.

Curvularia is a genus of fungi that mostly consists of plant pathogens, although several of its species can be harmful to humans as well.

What is Drechslera mold and how it can affect human health. Learn how to identify and properly remove Drechslera species from your home.

Epicoccum is a genus of filamentous ascomycetes which can mostly be found dissolving and recycling senescent plants tissue.

Epicoccum nigrum is a filamentous fungus belonging to the phylum Ascomycota and the Dothideomycetes class.

Epidermophyton is a genus of filamentous fungus belonging to an ecological group of pathogenic fungi called dermatophytes.

Eurotium is a genus that comprises the teleomorph forms of several Aspergillus species, notably the Aspergillus glaucus group.

Eurotium chevalieri is the sexual state of the species Aspergillus chevalieri that belongs to the division Ascomycota.

Eurotium repens is a cosmopolitan ascomycete fungus belonging to the xerophilic genus Eurotium.

The genus Exserohilum belongs to the family Pleosporaceae of the phylum Ascomycota.

Fuligo septica belongs to the class Myxomycetes, or slime molds, in the Protista Kingdom

Fusarium is a large and economically important genus of fungi. It includes numerous species and can be found worldwide.

Ganoderma is a genus of fungi that are renowned for their medicinal and pharmacological properties.

Geotrichum is a common fungus found worldwide. It grows on fruits, milk products, cereals, soil, air and plants. Geotrichum is also considered a normal part of human flora.

Genus Graphium comprises species of asexual, filamentous fungi belonging to the family Microascaceae.

Helminthosporium is a fungal genus belonging to the order Pleopsporales.

Species of the genus Malbranchea have been known since the 19th century.

Memnoniella, a close relative of the infamous Stachybotrys molds, is a mold that commonly develops on water damaged construction material.

Microascus is a genus of filamentous fungi belonging to the family Microascaeae and the phylum Ascomycota.

Microsporum is a filamentous fungus belonging to the ecological group of pathogenic fungi called dermatophytes.

There is a tall list of Mucor mold infections and Mucormycosis is the most common among them. Also known as Zygomycosis, Mucormycosis infections refer to a wide array of ailments caused by the Mucorales gene of fungi like mucormycetes or mucor.

Mucor amphibiorum complex is a dimorphic mold from the phylum Zygomycota, consisting of twelve species.

Mucor hiemalis is cosmopolitan, meaning they can grow in many different environmental conditions and geographical locations.

Mucor mucedo, commonly known as the common pinmold, is a ubiquitous fungal saprophyte and a pathogen.

Mucor racemosus is one of the first discovered and isolated soil fungi.

The Myxomycetes, or slime molds, are a group free living amoeboid protists with complicated life cycles.

Neurospora crassa is a filamentous fungus that belongs to the phylum Ascomycota.

The genus Nigrospora belongs to the phylum Ascomycota and is comprised of typically dark-spored asexual, filamentous fungi.

The genus Oidium comprises the asexual stages of Erysiphales

Paecilomyces as a genus of saprotrophic fungi that is widespread in soil and decaying plant matter.

Paecilomyces variotii is a wide-distributed mold that is readily found in composts and soils and a ubiquitous contaminant of foods and raw materials.

While Penicillium is typically non-pathogenic, there are a few exceptions. Some Penicillium species are capable of producing microbial volatile organic compounds (MVOCs) and toxins that can be harmful to human health, especially upon long-term exposure.

Penicillium brevicompactum belongs to the well-known genus Penicillium which contains over 300 species of saprophytic fungi.

Penicillium camemberti is a filamentous fungus from the genus Penicillium.

P. chrysogenum colonies are blue-green in colour with a yellowish pigment often appearing as well. However, identifying P. chrysogenum based on colour alone is not possible.

Penicillium corylophilum is a fungus belonging to the subgenus Furcatum of the Penicillium genus.

Penicillium crustosum produces several mycotoxins, the most prominent and the most toxic being the penitrem A.

Penicillium digitatum is a fungus in the family Trichocomaceae, genus Penicillium.

Penicillium echinulatum is a member of the well-known genus Penicillium which contains over 300 species of fungi.

Penicillium purpurogenum is a soil and plant saprophytic fungus and is characteristic of producing red pigmentation on growing media.

Penicillium roqueforti s a saprophytic fungus that grows in natural environments: forest, soil, wood, and plant parts.

Periconia genus is widespread, containing species that are usually saprophytic and specific plant pathogens or endophytes on herbaceous or woody plants.

The genus Peziza comprises about a hundred cosmopolitan fungal species.

Phoma is a genus of fungal organisms that is widespread throughout the world – its species are commonly found in soil, organic matter, plants and also in aquatic environments.

Pithomyces is a large genus of the order Pleosporales which belongs to the phyllum Ascomycota.

Poria Incrassata differs in several important characteristics from most other building decay fungi. Its ability to attack wood of most species and to conduct water to the decay site accounts for its destructiveness.

The genus Rhizopus is one of the best known and most widely studied Zygomycetes fungi.

Rhizopus microsporus is primarily a fungal plant pathogen that affects corn, sunflower, and rice.

Rhizopus oligosporus is a mold belonging to the family Mucoraceae and is widely used for the production of fermented food products.

Rhizopus oryzae, also known as Rhizopus arrhizus, can be viewed as a double-faced mold.

Rhizopus stolonifer (known as common black bread mold) is classified as Zygomycota family Rhizopodaceae (Mucoraceae), genus Rhizopus.

The fungi of the genus Rhodotorula are environmental yeasts that belong to the phylum Basidiomycota.

Scedosporium fungi belong to the family Microascaceae, within the phylum Ascomycota.

Schizophyllum commmune, commonly known as Split-gill fungus, is the most famous species of the order Schizophyllales which belongs to phylum Basidiomycota.

Scopulariopsis, discovered by Bainier (1907), is a genus of fibrous fungi belonging to the group Hiphomicetes. Learn all about Scopulariopsis

Scopulariopsis brevicaulis is type species of the saprophytic genus Scopulariopsis, which belongs to the family Microascaceae.

Serpula lacrymans is a species of mold that is well known for causing dry rot of wood in many buildings. It is highly destructive, spreading over wooden structures and degrading the cellulose in them.

Smuts are characterized by the formation of dark, thick-walled spores called teliospores. There are approximately 1640 species that are regarded as ‘true’ smuts, most of them belonging to the Basidiomycota division.

The genus Sporothrix belongs to the order Ophiostomatales, phylum Ascomycota.

Sporothrix schenckii complex is a dimorphic fungus from the phylum Ascomycota, well-known for causing the disease sporotrichosis that infects humans and animals.

Stachybotrys is a genus of molds that can be found worldwide, in both indoor and outdoor settings. This article reviews this group of molds, their characteristics, the effects they can have on human health as well as sure ways of removing Stachybotrys mold.

Stemphylium is a well-known monophyletic genus of ubiquitous, dematiaceous filamentous ascomycetes, classified in the Pleosporaceae family of fungi.

Torula is the fungal genus that belongs to the family Torulacae, order Pleosporales.

Trichoderma is a group of filamentous fungi typically found in soil, plants and wood.

Trichoderma viride is considered to be an opportunistic, non-virulent, symbiotic fungus and often used in biocontrol of important plant pathogens.

Trichophyton is a genus of fungi that belongs to the group known as dermatophytes. This group of closely related fungi have the ability to invade keratinized tissue like skin, nails and hair and produce an infection.

Trichosporon species are urease-positive, non-encapsulated basidiomycetous yeast-like anamorphic organisms with no known sexual state.

Ulocladium colonies can be brown, grey or black, with a texture that resembles suede, cotton or wool. Ulocladium grows moderately fast (reaching maturity within 5 days) and typically disperses its spores by air.

The genus Verticillium encompasses a cosmopolitan group of filamentous fungi, including several pathogenic species.

Wallemia fungi are characterised by their low requirement for water and their ability to colonize environments with high amounts of salt.

Wallemia sebi is one of the seven species of the genus Wallemia.

Zygomycetes belong to the phylum Zygomycota or conjugation fungi, which includes molds.

Our Mycology Team:

Chief Editor / Mycologist