This was a gift in Thailand

[Acharn]

This sympodial was given to me by the parents of a nephew-by-marriage, who live in Phitsanulok, Thailand. It appears to have been gathered in the wild. It is on a tree branch about two inches thick, and there are ten pseudo-bulbs on the rhizome. I don't have an adequate reference book yet, but I did find one picture of an Oncidium that seemed to have this shape of bulb. I included a ruler in the picture so you can see the bulbs are about six inches high, and they have four or five leaves.

I just got the plant last week, so I've never seen it in bloom, and their enthusiastic statement that, "It has very beautiful flowers," doesn't help much. I sure would like to know what species it is so I would know better how to care for it. Luckily I live in Thailand, so it should thrive outdoors if I can find out how much light it needs.

I really would like to find some way to get this plant off the branch and divide it into three, but the roots are so solidly attached to the wood that I may not be able to do that without killing the plant.