This one is unusual, for sure (but I don't know if it is rare); this plant has a history: the original was found in nature, and divided (I don't know if the original owner sold the whole plant) between Sergio Gutfreund (
ecoorquideas ) and Creuza Müller (
Orquidário da Mata ). Sergio sold his part (the whole part?) to an american citizen which japanese ancestry, and Creuza sold me half of her part. Creuza's plant pic is in the "Coletânea de Orquídeas Brasileiras vol. 2 - Bifrenaria" , author Marcos A Campacci (november 2003) (
Brasil Orquídeas ). Maybe an 'alba' variety?