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Citric Acid and Other Organic Compounds
![Colonies of Aspergillus niger](../../../../../../../../../figures.boundless-cdn.com/11354/full/x-aspergillus-niger-on-sda.jpeg)
Colonies of Aspergillus niger
The black dots covering the colonies are Aspergillus spores. The growth medium is Saboraud's Dextrose Agar (SDA)
Source
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"Aspergillus niger on SDA."
http://en.wikipedia.org/wiki/File:Aspergillus_niger_on_SDA.JPG
Wikipedia
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