This is by no means a full list:
http://www.erowid.org/chemicals/maois/maois_info3.shtml. However, as my time as an Erowid volunteer, I can tell you that I've triaged enough (not like a crazy ass amount, but enough) trip reports, and other publications for this sentence to hold to true:
MAOIs can and will dramatically increase the effects of some of these drugs to the point of becoming dangerous
Not that I got my little MAOI disclaimer out of the way, no Ginko will not affect magic mushrooms, from the MAOI effect that is. It takes massive doses of strong Ginko
concentrate in order to even have an effect on MAOI's in your body. Not only that but it's only initially that Ginko would do anything, its effect on MAOI's in your body stops working (even at high doses) within only a week or two. In fact, Ginko acts much stronger Serotonin, which usually results in tryptamines losing their potency *
Now let's get to my experience :D... I've always been on large doses of Ginko in my supplements, keeps my head clear and my body feeling good. If anything, when I'm on those herbal supplements (not concentrates) my mind is more clear headed and I'm more 'grounded' during a trip. So basically it has an effect that cannot be described as potentiation. I would sum it up as keeping your mind a bit 'cleaner' or less overwhelmed during a tryptamine-substance (LSD, mushrooms, DMT) trip. I've found it's best used to prevent people from going over the edge, or having a bad trip. Sorry about the way I describe it, but it's hard to describe affects on trip easily, as you probably understand.
So, if you're trying to maximize your stash, it's probably best to just take the shrooms. You might be disappointed and find the nootropic effects of Ginko to actually be paradoxical and result in your shrooms losing their potency; or diminishing the effect you're are looking for. Like I said, it's best to stay away from MAOI's as a drug potentiator except when using ayahuasca, the results can be unpredictable. I've read stories of people mixing Syrian Rue (which contains Harmaline, a relatively strong MAOI) and LSD in order to increase the effect of their last - weak - hit and end up in the hospital or have seizures.
Stay safe my friend.
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Main Source:
*Fehske, Christian J.; Leuner, Kristina; Müller, Walter E. (2009). "Ginkgo biloba extract influences monoaminergic neurotransmission via inhibition of NE uptake, but not MAO activity after chronic treatment". Pharmacological Research 60: 68–73.