Bulb exiguum (lots)

[Undergrounder]

Hi

I picked up these guys from a nursery that collected them from logging forest under license. I don't know how many there are but for reference they're crammed there into a seedling tray, Each pseudobulb would be about the size of a pea.

I've never had a Bulbophyllum before, so how should i care for them? Mount on tree-fern or something? do they handle being constantly wet or do they need a dry period?