The various forms of the Cattleya species get descriptive names (e.g. coerulea) but I don't know of a source that lists the described forms for each species. Yes, for the few where something is a var. Occasionally someone talks about a fma. (forma) of something but I don't know if that is an official descriptor or not. Leslie must have a secret judges handbook that lists all this stuff. All of these purpurata forms are certainly not in Chadwick's book!
Terry, there is a Brazilian book on purpuratas by Lou Menes, where she describes all the colour forms.
Also I heard a great purpurata talk by Sergio of Olompia Orchids from California of the ways the color forms can be divided by the markings of the lip.
In AOS, there is no training on the various color forms of purpuratas as there is too many. Usually similar colors are judged against each other like the werkhauseris and then the average is compared against all purps. I hope to attend a purp show in Brazil to learn more.
Side note that may be a bit confusing: Colors are designated as forma or fm. and not as varieties (var.). This means a color form is not a 'new' variety of the species. To be designated as variety, you need to have floral difference in shape and markings such as a rounder or longer petal. So technically this flower is Cattleya purpurata fm. werhauseri (coerulea).
