This looks like a dendrobium from section grastidium, and most closely resembles Dendrobium alticola in the book that I have. Can anyone confirm that identification?
The flowers lasted for two or three days, I think.
That seems like the best match. Its petals and sepals are much thinner or elongated than my referance of alticola though. Perhaps it's some variation... Either way it's an interesting species, I love Dendrobiums