A friend of mine offered me this plant. I know it is quite difficult to identify without flower but any idea of what specie or genera it can belong to ?
I found what it is: Bulbophyllum blepharistes.
Yes, it is a Bulbophyllum blepharistes. Here a picture of the inflorescence:
The flowering time is between the month of June and November. In Thailang this species can be found in the North, Northeast, South and Central Region.