After seeing the details of the indumentum I am reasonably confident that I have this ID correct. D. ascendens would have longer hairs on the scape I believe.
As species go, this is a more recently described one, and another of the wonderful Brasillian species (aren't they all?). Watching the anthesis is an exciting event for me, considering how hard and long I searched for this plant. Fernando has the advantage in his searches: at least he knows where he can find HIS material, LOL. I have to search with my fingers on the keyboard and my hat in my hand. When it comes to finding gifts of the Brasillian material, it's a hard cold world out there. I hope to spread this "little victory" to many growers soon, and bring a little of this fire of Brasil to light in your terrariums in the coming seasons.