First, thanks Ian for the pics of the whole spike. Looks very impressive.
Re the female flowers. My Cstm Tengku Zainab Petra ( I have already posted pics of it) produces female flowers quite readily, usually after a rise in temperature during the flowering season.I've had this plant for more than 30 years but unfortunately have not seen fit to take pictures of the female flowers....they, being extremely ugly. The next time the female flowers appear i'll make it a point to photograph them .. just for comparison.Didn't know about the hermaphrodites until now. Just realised that this year Cstm T Zainab Petra must have produced 3 of them on a short spike looking very much like the female form except that they possessed the trigger-like antennae attached to the pollinia(like the male flowers) and also the two, spotted lateral sepals, which in the 'pure' female form exist only as vestigial sepals , green without spots. Again didn't take any pics. Regrets, regrets, regrets...What a missed opportunity !!!