Identifying Green Mold on Cheese: A Microscopic Approach

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The dark green mold found on old white cheese is not solely penicillin; it can be attributed to various fungi, including Cladosporium and Aspergillus, in addition to Penicillium. To identify the specific mold, preparing a microscopic slide and examining it under a light microscope is recommended. The green color typically indicates the presence of fruiting structures, such as conidiophores and sporangia, which are distinctive and can be identified through their unique spore morphology. Comparing observations with online images of these fungal genera can aid in accurate identification.
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What is the dark green mold on old white cheese called? is that penicillin?
 
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It is not that simple. There are several fungi (aka molds) that may colonize cheese and appear green (eg. Cladosporium, Aspergillus as well as Penicillium). If you are really curious, prepare a microscopic slide with the mold and view under light microscope (low to medium magnification should be fine). The green color is typical evidence of fruiting structures (conidiophores, sporangia). These structures and spore morphology of common fungi are unique and are fairly easy to identify using a microscope. As a good starting point, I would compare what you observe to online photos of the above genera.
 

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