It could also be a species of true Pothos. There are a few that have that look. They are pretty uncommon though, but it would not be out of the question that botanical gardens and tropical houses like that might have specimen plants. Dr. Peter Boyce is doing a revision of the genus Pothos, and has some photos online somewhere, from Sarawak...and there are some photos of true Pothos on the aroid photograph site, but they are poorly documented online as a whole
