Scanning electron micrograph (SEM) depicts a close up of an asexual Aspergillus sp. fungal fruiting body. This reproductive structure is composed of a septate filament known as a conidiophore, which is topped by chains of conidiospores. Note that the white and black bar at the bottom of the image represents measurements of 10繕m. Aspergillus is a fungus (or mold) that is very common in the environment. It is found in soil, on plants and in decaying plant matter. It is also found in household dust, building materials, and even in spices and some food items. There are lots of different types of Aspergillus, but the most common ones are Aspergillus fumigatus and Aspergillus flavus. Some others are Aspergillus terreus, Aspergillus nidulans, and Aspergillus niger.