Most Common Types Of Mold.

Molds are fungi that can be found both indoors and outdoors. Molds grow best in warm, damp, and humid conditions, and spread and reproduce by making spores. Mold spores can survive harsh environmental conditions, such as dry conditions, that do not support normal mold growth. There are said to be over 1.5 million species of mold in the world, yet only 100,000 have been identified.


The five most common types of mold are:

  • Alternaria– commonly found in your nose, mouth and upper respiratory tract and can cause allergic reactions.
  • Aspergillus– usually found in warm, damp climates. It produces mycotoxins which is a poisonous chemical compound. This type of mold causes lung infections and aspergillosis.
  • Cladosporium– common outdoor fungus that can find its way indoors and grow on textiles, wood and other damp, porous materials. This mold triggers hay fever and asthma symptoms.
  • Penicillium– commonly found on wallpaper, decaying fabrics, carpet, and fiberglass duct insulation, especially areas that have been damaged by water. It is known for causing allergies and asthma. Some species produce mycotoxins, commonly known as the antibiotic, penicillin.
  • Stachybotrys– commonly found on wood or paper, this mold is known as “black mold” and is extremely toxic. It produces mycotoxins that can cause serious breathing difficulties and bleeding of the lungs.


Molds are very common in buildings and homes and will grow anywhere indoors where there is moisture. Spores in the air outside also attach themselves to people and animals, making clothing, shoes, bags, and pets convenient vehicles for carrying mold indoors. When mold spores drop on places where there is excessive moisture, such as where leakage may have occurred in roofs, pipes, walls, plant pots, or where there has been flooding, they will grow. Less toxic molds can be removed by a simple cleaning, however toxic molds, such as Stachybotrys, needs professional attention as soon as possible.



Sanjay Gupta. “Mold Facts And Information.” Web blog post. Asbestos Mold Connecticut. 5 June 2015

Images provided by Google.


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