What Aroids Form Tubers on Leaves?

I just joined this list because I've discovered that many of the plants I 
like to grow are aroids!  Someone I know just acquired a plant of unknown 
identity that looks a lot like pictures I've seen of various Amorphophallus 
or Sauromatum, etc.  The weird thing about it is that it was forming tubers 
at what I'm presuming are the leaf axils (I'm not up on my aroid 
anatomy.)  The largest one, about 2cm diameter, was right where the leaf 
joined the main, upright stem.  Is this unusual or are we going to have to 
find some other way of identifying it?  Unfortunately the thing has just 
gone dormant (we hope) or I'd be able to describe the leaf and stem a 
little better.  We're potting up the main tuber and the little tuber-ettes 
to see if they'll grow.  Thanks in advance for any info you can share!

Mark
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