#3 is a Bulbophyllum but definitely not rothschildianum, more likely one of the many (hard to distinguish) hybrids using fascinator. #5 looks like Bulb. appendiculatum.
#6 is very interesting, BTW, I agree it looks like a Dendrobium with the growth and spike habits resembling something in section Callista, but the flowers would be very unusual for that section...
Last edited by gnathaniel; 03-10-2014 at 03:01 PM..