I can't guess wether it's fungus or not, but I can tell you that the 80mm Nikkor I use has noticeable dust between the elements, I'm not sure if it's coated or not, and it still sharper than the 80mm schneiders I used in college (which are supposedly far superior than the Nikkors). I guess the lack of fingerprints in the front element is the main difference.

My point is this: Print with it. You'll probably realize that it's as sharp as anything you can imagine. If you take the elements out however, you might screw up the spacing, or something like that, and do more harm than good.

Whatever you decide to do, though, good luck!