dendrobium cucumerinum white film

[KristenReuel]

Hello!

I have a dendrobium cucumerinum that I purchased a few weeks ago. It has been doing well, growing new roots, but I've noticed in the past couple of days that some of the bulbs/leaves (not sure what they are. The "pickle" growths) are turning whitish. It was not there when I first got it. At first I thought it was a white film, but I tried removing some with my fingernail and nothing came off. None of the growths are becoming squishy, but I'm perplexed and worried about the white areas. Has anyone experienced this before?

It sits hanging from another orchid in a south window, next to my dendrobium loddigesii, which is doing just fine. It gets soaked once a day in distilled water, sometimes rainwater. Fertilized once a week.

The "whiteness" is not a heavy opaque, it's more transparent and filmy. Also, none of my other orchids seem to have it.