It appeared a long time ago on some of my Bulbophyllums and has migrated onto almost all of them. Bulbs like a moist environment and so does moss. I have taken to transplanting a small bit of it to a newly potted plant and it does the rest from there !

I use shallow containers like ZipLock and put holes in them. I put about 1" of leca in the bottom and the rest is New Zealand sphagnum. I have each one sitting in a saucer so that when I water or fertilize I leave about 1/2" in the saucer. They are under T8 fixtures (4 foot with 6 bulbs) for 12 hours/day and 15/day during DST. I use 20-10-20 urea free GrowMore about every other week at 1/2 tsp/gal. I have a ceiling fan and a humidifier on 24/7.

This bulbophyllum is so cute:)

That is awesome, Chryss...tiny beautiful flower...

@Tindo...I get some moss from the sidewalk in spring(sometimes scraped from old big trees on the street)...and transfer it to the media of the pot I want to have it grow in...in a couple of months it spreads all over(you need constant humidity and shaded sun) and the sun in New York is bright and stronger thru the window glass

My second tiny division has one spike that's ALMOST fully open ! I'll post the pix when it is.

new bloom, new pix
 

Just opened another single !!!
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Sweet blossoms!

Thanks, Gloria !

Sweet.Nice photos.