D. bulbifera does make aerial tubers. They look a lot like potatoes,
which has earned the plant the common name "Air Potato." It's
commonly cultivated as a curiosity. In some cultivars the tubers are
edible. You can see an image at:
http://botany.cs.tamu.edu/FLORA/dcs420/fa08/fa08071.jpg

M. Reed

David Hershey wrote:
Hortus Third also says D. bulbifera produces
aerial tubers,