Rogier,

I think that falangiferum is actually fariniferum (I bought it with an almost unreadable and hand-written label at the RHS orchid show a few years back).

My D validicolle looks very similar: maybe slightly thinner and longer pseudobulbs, slightly bigger leaves and habitus, but nothing which could not be normal variation and the flowers look a little bigger. But putting the two plants together I can't see much difference. They also often flower at the same time. I have tried several times to pollinate, but did'nt get any seed (either through selfing or between the two plants).

It seems to me that masses of flowers (usually about 5-6 that open at the same time on one plant) for both plants are induced by weather patterns.