Dendrobium hellwigianum

I have two plants of this species, this one with bluer flowers than the other, which other plant has flowers that open pink and fade to an off-white.  The species is from New Guinea and when given cool temperatures, high humidity and high light can produce hundreds of flowers on a small plant.  It belongs to the Oxyglossum section of the genus Dendrobium, and is a miniature like most of the other species in that section.  This plant is 8cm tall, each growth having three or four pencil-like leaves with a deep channel down the inside.