We recently mentioned Dendrobium aurantiflammeum in this thread:
Dendrobium aurantiiflammeum
Note it is spelled with only one "I", though I have seen it offered for sale spelled with two "I"s.
It is related to the "pigeon" or "thunderstorm" orchid, Dendrobium crumenatum, in Dendrobium section Crumenata.
I received some Dens recently from Hausermann's. Shown are Den. aurantiflammeum and Den. auriculatum (section Dolichocentrum.) They are in 2" / 5cm diameter, but taller, pots. The wire fence in the photos has 4" openings.
Dendrobium aurantiflammeum from Hausermann's, above.
Dendrobium auriculatum from Hausermann's, above.
The Den. aurantiflammeum had spider mites soon after arrival. I don't know whether it arrived with them or not. I have been spraying all my Dens with dish soap solution daily since.