I finally heard back from Sean Abbott, the hybrizer of this particular plant. Sean also included two photos of the G. bowringiana he used in the cross.
Hi Christine,
Nice orchid! Thanks for the photo, the flowers look as expected, shape with the leopoldii influence and color from the bowringiana. Too bad about lacking spots. The parentage is from some Canadian plants crossed in Alberta in the late 90's. The Guarianthe bowringiana used as pod parent was a huge specimen plant at the University of Alberta Devonian Botanic Garden, the pollen parent was definitely the Cattleya leopoldii type, but I don't think I have a photo. The rules for orchid name registration may still treat Cattleya guttata and Cattleya leopoldii as the same, hence the name Bactia perhaps applies to both forms of the hybrid. It looks like Cattleya tigrina is the new accepted species name for the creature we have called Cattleya leopoldii or Cattleya guttata var. leopoldii. You would need to ask a AOS judge like Ramon De Los Santos for confirmation of hybrid name according to current registration rules.
Your orchids look great in the photo,
Sean
