The flower of this Bulbophyllum proved irresistible to a local fly. The hinged lip pressed the fly into the stigmatic cavity. The fly got stuck in place due to the stigmatic fluid. The fly was struggling and trying to escape but without success. Very gently I released it, the fly fled with admirable alacrity. So far no other insect has become trapped in the flowers. I suspect the flower is producing a fragrance with a distinct fecal tone for the flies to be so interested in the them, but so far I haven't been able to detect any fragrance at all.
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