Zygonisia Roquebrune (Zygopetalum 'Artur Elle' x Acacallis cyanea)
This is the first time I have bloomed this. I think this cross comes from Terry Root at the Orchid Zone. I bought this one in bloom a few months ago, and the second blooming is much darker with less broken color on the petals. Maybe this is a result of my warm growing temperatures, I don't know. It has four blooms on this spike and a second spike coming on.
Here is the first blooming.