Very nice flowers. Most of my Dens are in bud or bloom.
Bill Kemp in South El Monte

This orchid is the cornerstone of Australian Dendrobium Hybrid breeding.
The taxonomists tried to change the name of varieties to separate species names which would be a disaster because no one kept records of which particular variety was used in making the many hybrids.
I think the orchid pictured is the variety giganteum.

Very nice! I recently purchased the species, and luckily it came in flower. I specifically chose it because it is Australian in origin, and seems to be able to take extremes of temperature according to SBorchids.
Cheers and happy growing~
Maryanne

I have from a recent trade with Nick, Dendrobium Hilda Poxon that is half tetragonum and half speciosum. To my surprise I see the start of 3 spikes. I'll post pics if they bloom.

What is your growing conditions for this Den. How low a temp can it tolerate?

It summered outside so so summer temps were in the mid 80s down to the mid 60s. I left it out until night temps dropped into the low 40s. It was not phased by the colder weather. I bet it could take a few nights in the 30s. Now it is in the indoor space where it gets between 75F and 58F. It is under a 125 Watt CFL. The only issue i have is it quickly becomes displeased when it dries out for a couple of days. The leaves will curl and the buds will blast.