Man points at mould in the corner of the window.

Mould classifications

Some types of mould can cause a serious risk to health. In this mould classifications post you will learn about the most common types to better understand which type you may have in your home and how you should treat it.

Mould classifications

There are many more different types of mould, but they are all classed into three groups:

  1. Allergenic – these are the types of mould that can cause allergic reactions in those who are sensitive to common allergies (dust, hay fever etc.)
  2. Pathogenic – these moulds can cause health problem in those that have underlying medical conditions.
  3. Toxigenic – these are the dangerous types of moulds that are toxic and therefore can cause serious and even life-threatening health conditions.

Types of mould

Mould colony set in petri dishes

There are a huge variety of different types of mould, but the most common ones seen inside the home are:

Black mould (Stachybotrys)

This is the most “infamous” mould. It is black to very dark green in colour and slimy to the touch. It grows in places that is consistently wet such as bathrooms.

Black mould has such a bad reputation because it produces mycotoxins – chemicals that can seriously affect human health.

Green Mould (Cladosporium or Penicillium)

These types of mould have a green to green/brown colour and has a velvet or suede type of texture. Cladosporium will happily grow in either warm or cold environments and it likes things such as carpets and curtains.

Don’t let the fact that Penicillin derives from Penicillium fool you – it can cause many health problems too. It usually grows in damp conditions and can be found on wallpaper, mattresses and air ducts. It also spreads incredibly quickly.

White Mould (Mucor, Chaetomium and Acremonium)

There are a few “white moulds” with the most common being Mucor, Chaetomium and Acremonium. They are all allergenic or toxigenic and are most common in severely damp houses.

Acremonium is actually a carcinogen and can have a severe effect on the body including the immune system, bone marrow, brain function as well as other internal organs.


We hope you found this post on mould classifications helpful. If you have any other advice or top tips, please feel free to leave them in the comments below. We love hearing from you!

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