Which type of mould is commonly found outdoors?

Aspergillus is a type of mould that is commonly found outdoors in various environments. It thrives in different substrates, including decaying organic matter, soil, and plant debris. Aspergillus species play an important role in the decomposition of organic material, which is a natural part of the ecosystem. Some species of Aspergillus are also known for their resilience and adaptability to various environmental conditions, which contributes to their prevalence outdoors.

In contrast, other mould types listed may also be present outdoors but are less frequently encountered or are more commonly associated with specific indoor environments or conditions. For example, while Trichoderma can exist in soil and decaying wood, it is often found in more specialized ecological niches. Mucor has a preference for decaying organic matter as well but is primarily recognized in indoor environments related to food spoilage. Stachybotrys, also known as black mould, is typically associated with water-damaged materials indoors and is less commonly found in outdoor settings.

Thus, understanding the ecological role and common habitats of these moulds clarifies why Aspergillus is the most representative of outdoor environments.