pollinator
 

Please tell me what insect is the pollinator of Bulbophyllum bicolor ?

Flies.

Almost all Bulbos are fly pollinated. That's why they smell like rotten flesh, or fish that's been laying out in the sun for a while, dog poop, or overripe fruit.

What species of fly - I don't know.

Thank you very much for your prumpt reply.
CZT