Subject: How do I know what mold is growing on oranges?

I'm about to do a science fair experiment on the growth of mold with different
types of acid in the environment. I'll be observing this in petri dishes holding
the mold on some sort of agar.

Anyway, my partner and I were planning on growing mold on an orange first and
taking that mold to put into petri dishes. However, I'm not quite sure how we
can identify the mold that grows (and even what mold grows on oranges in
general). What types of mold grow on oranges and how can I identify them?

Re: How do I know what mold is growing on oranges?