I received this and many other orchids as gift from an orchid grower to start my collection and this was one of them that had no tag. Its grown many pseudobulbs since and I would like to know what it is so I could have a better chance of blooming it.
I'd say Bulbophyllum as well. Did the person you got it from not have an idea what it could be? They may at least be able to give you a list of what it might be, based on what they know that they grow.
__________________ Camille
Completely orchid obsessed and loving every minute of it....