Bert, I know there is a lot of confusion about these. I am fairly sure the plant I posted as Coel Unchained Melody above on Jan. 11 looks pretty much like your Unchained Melody.
Here is Santa Barbara's Coel Unchained Melody also
http://www.sborchid.com/plantd...
I can't really discern the difference in your picture, but you should be able to make it out?
Here is a good picture of Coel intermedia
http://forum.theorchidsource.c...
