This is a relatively large plant with angled pseudo bulbs and showy flowers. The flowers have a distinctively long calcar, or spurlike structure, and Hoehne, taking this into account, described it as B. tyrianthina var. magnicalcarata. Pabst was convinced that the long calcar was a characteristic strong enough to allow splitting it into its own taxon and elevated it to species category. What is hard to understand is why Kew Checklist insists in placing it as a synonym to B. tyrianthina!
Here are the flowers:
Bifrenaria magnicalcarata (Hoehne) Pabst on Flickr - Photo Sharing!
The plant and flowers:
Bifrenaria magnicalcarata (Hoehne) Pabst on Flickr - Photo Sharing!
Detail of the hairy lip:
Bifrenaria magnicalcarata (Hoehne) Pabst on Flickr - Photo Sharing!