It's an Eptidendrum (a group that has been moved from Epidendrum to Nanodes and back to Epidendrum), related to Epi. porpax. There are a bunch that look very similar, and that also get moved around as far as what species are distinct and what are synonyms so you will probably not get a positive species ID - even the scholars disagree on the details. But it's similar to Epi. discolor, Epi. gnomos, Epi. schlecterianum, Epi. purum, etc. in terms of growth habit.
I agree with Roberta, Epidendrum. I recently acquired a Epidendrum congestoides and it looks very similar. Your picture looks more like schlecterianum. Nice plant!