Identifying Green Mold on Cheese: A Microscopic Approach

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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.