Welcome. I'm not much of a Brassia grower, since they all look pretty much alike to me, but your avatar looks to be atleast 50% Brassia. You might want to look at the Orchid Encyclopedia under Brassia, and see if there is one with dark petals like yours. Most have green/white petals.
http://www.orchidspecies.com/#sec1
Cynthia, Prescott, AZ