Aspergillus fungus. Coloured scanning electron micrograph (SEM) of the fruiting body (conidiophore) of a typical mould (Aspergillus sp.), showing chains of spores (conidia, round). Various species of Aspergillus are used commercially, for example in the production of citric acid, or for digesting the starch in rice as a step in making sake (rice wine). Some species of Aspergillus occasionally act as human pathogens. Magnification: x5000 when printed 10 centimetres high.