How do you identify fungus on a camera lens?

I have an old Minolta Rokkor telephoto lens with some faint marks on it. How can I determine if it is fungus?How do you identify fungus on a camera lens?
The best thing to do is to look through a lens with a bright light shining through it while the aperture is open.





Fungus generally appears as clusters of hair-like fibers.How do you identify fungus on a camera lens?
You could take a picture of it.
Lens fungus is a plant, and it looks like a plant growing across the lens element.





It's most often found on internal elements where moisture collects and can't dry out.





If the marks are on a front or back element and they look like streaks, they are cleaning marks.





HTH


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