Glad you got to see the greenhouses, Ken. My husband, Paul, is the main volunteer for the orchids. He is there all day nearly every Monday. Unfortunately, as you said, many orchids are unlabeled. They either came to the MBG without labels or were misplaced over the years. The MBG has not given any attention to the orchids for the last 15 years prior to Paul starting to volunteer. He and one other member from our society have turned the orchids around from almost losing the entire collection to something that is half decent, but it has taken a massive effort for the last 6 years.
In the process, they have garnered 4 AOS awards for cultural merit.
We have attempted to identify many of the species orchids with the help of AOS experts and have been somewhat successful. Unfortunately the hybrids can never be fully identity confirmed, which is a real shame.
The three big orchids in your photos are Den nobile, Den Gatton Sunray FCC/AOS, and Bulbophyllum phalaenopsis 'Magnifico' AM/AOS, CCM/AOS. The Bulbo was donated to the MBG from the collection of Jo Levy and has the scent of dead rotting meat.
Glad you enjoyed the trip. Next time, come sooner in the spring or later in the fall to see more blooms!