Dendrobium bigibbum

Comments:

(previously identified as Dendrobium phalaenopsis)

Identified originally by Larry Kipp - Lawrence, KS USA and confirmed by Kalan Toy - San Jose, CA USA

Matthew Renner, member of the Australasian Native Orchid Society of New Zealand, comments:

Den. phalaenopsis is now regarded as conspecific with Den. bigibbum.

This looks to me to be a hybrid, Den. Peewee, which is a cross between Den. biggibum and Den. tetragonum. It has thinner lateral petals and a pointed labellum? (I can't quite tell for sure from the photo)