As a comparison, here is an extremely rare alba form of the species. This is from 1987, back in my early days as an award photographer. That was five years before the West Palm Beach judging center opened. There was considerable discussion, both before and afterwards, as to whether or not this was was it was exhibited as. I sent a photo to the late Jack Fowlie and phoned to ask him what he thought. Having only a photo, he neither confirmed or denied the ID. He did thinkit was pretty interesting though. My question to you is: if it is not an alba C. amethystoglossa, what else could it possibly be?
requeim: I happen to know the owner very well and this plant went to orchid heaven a long time ago. Too bad.
See
my album for the judges comments