I got this off ebay earlier this week. Luckily it has a few blooms. THe plant is amazing, is a mini-small sized (4-8inches or so). It is a LARGE specimen that is tagged from 1993, so it has had a lot of grow in time. Not the flashiest, but the plant is gorgeous. Thanks for helping ID it.
I have it narrowed down to the subgenus: Pleurothallis in the Macrophyllae-Fasciularae section I believe. Here are the species I am thinking it may be:
P. bivalvis (archidiaconi) green form
P. conicostignia
P. matudana
P. prolaticollaris
Ed Parker