CandaceGary, do all the flowers on the spike have this? You'd have to reflower it to see if it's genetic or not. It wouldn't matter to me, I think it's cool.
The experts claim that it is a genetic "throw back" to a time with slipper orchids looked like most other orchids. That is, a whirl of 3 sepals on the outside, a whirl of 3 on the inside and a fused column (male/female).The the split ventrals genetic or cultural or... ?