An Iskar with a Fungi Tunic and spell Regen will regain health faster than a Human with a Fungi and spell Regen. Beyond that, I really don't know the inner workings of it.
I would imagine Great Bear = Spell regen = not stacking with Regrowth
Aura of Battle = item regen = not stacking with Fungi
So from purely observational evidence, you can have racial regen + item regen + spell regen and beyond that it most likely will not stack
EDIT: Since we are using the titanium client it would make sense for their to be a cap since in later expansions there are AA's to increase how much you can regen. Is it possible to hit that cap with the items we have available? No idea
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