>It *is* in cultivation at least at the Botanic Gardens of Bonn and
>Wuerzburg (both Germany). There will be an expedition with
>(inter alia) the goal of seed collection this year. So
>_Triphyophyllum_ is at least approaching even tissue culture.
>Nevertheless I do not think that _T.peltatum_ will ever become
>a plant for everyone's window sill.
That's wonderful news, I'm glad to hear the plant is being cultivated. 
I hope the expedition is a success.  When one of you talented Germans is
able to produce _T.  peltatum_ in tissue culture be sure to drop me a
line, I've already reserved it a special place on my Ivory Coast taxa
windowsill, what, you mean everyone doesn't have one?  Surely you jest! 
:-) 
Regards,
Demetrios