Aspergillus is a genus consisting of several hundred mold species found in various climates worldwide.
Aspergillus
Aspergillus on a tomato in detail
Various Penicillium, Aspergillus spp. and other fungi growing in axenic culture
Historical model of Aspergillus, Botanical Museum Greifswald
A mold or mould is one of the structures that certain fungi can form. The dust-like, colored appearance of molds is due to the formation of spores containing fungal secondary metabolites. The spores are the dispersal units of the fungi. Not all fungi form molds. Some fungi form mushrooms; others grow as single cells and are called microfungi.
Penicillium mold growing on a clementine
Spinellus fusiger growing on the mushroom Mycena haematopus
Several species of mold growing on a slice of bread.
Mold on dried Hibiscus sabdariffa