Typically presents as bluish-green colonies and is found in diverse habitats, including soil, indoor dust, and even marine ecosystems where it has been linked to coral disease. Indoors, A. sydowii favours moist and humid areas (e.g., bathrooms, damp walls). When present in large quantities, it can contribute to compromised indoor air quality and provoke hypersensitivity in allergic individuals. Improving ventilation and reducing humidity are key to managing its spread.