I just re-discovered Estacion Seca's report on a talk by Amy Chung Jacobson, which he posted on 5/22/16 on OB. I don't know how to point to it. This was his opening sentence for a very thorough report, including forms and colors:
On Thursday, May 19, 2016, Amy Chung Jacobsen, AOS Judge, from Los Altos, California, spoke to the Desert Valley Orchid Society on Laelia purpurata Lindl. 1852.
Unfortunately her talk didn't help me with the forms that I have, so I am still seeking enlightenment.