Marschner (one of my favorites, BTW!) is certainly in the public domain. If you are getting the parts on rental, that should take care of it (in rare cases, it doesn't, but I think you're OK.) Assuming you are doing it in the original German, you're probably in the clear.
Just to be safe, though, you should contact the publisher, which I bet is Peters. I forget who their US agent is, but I'm sure it's one of the "biggies."
I used to direct an opera workshop, and when doing works (including translations) I always went to the publisher (G. Schirmer, Boosey and Hawkes, whatever) to get the rights. ASCAP and BMI aren't really applicable in most cases, and even if they were (say for Menotti, whom I'm sure belongs to ASCAP) then the publisher will take care of it.
Good luck, and congratulations on an excellent choice!
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