I PM'd The Wise Rygar on a similar matter and this was his response, hopefully he doesn't mind if I share it.
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				...Only caveat is there is limit to how much you can regen from worn / racial items. I don't remember what it is, but I'm pretty sure Fungi + Iksar racial puts you at the cap for regen...
			
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					Originally Posted by  Veleria
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				I had read there is an item regen cap of 15 total. I have nto been able to test this out personally as the items I would need are out of reach for me. Racial and spell regens are separate from this and not affected by any caps other than what will stack in your buffs. 
			
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 So by the sounds of things.. Regen cap is 30 from worn items but racial regen also applies to this cap.
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So a hypothetical Iksar/troll is +12 standing at level 60.. +15 with a fungi = 27...
Then would an additional worn regen of +3 or greater put it at 30 while standing?
And while a 60 iksar/troll is sitting +18, with a fungi +15,= 30(cap?), Any additional worn regen would have no affect?
IE: it may be benefitary to have another worn regen other than a fungi due to standing/FD only being +12/+14. So one is always at worn regen cap.