I have been following a Pleurothallis anthrax plant growing on a tree on my property and I think I see how it propagates.
This is the tiny flower:
This an overview of the plant with flowers:
This is the plant long after the flowers are gone. The upper sides of the leaves have wispy tendrals and the leaves and their stalks begin to turn back towards the host trunk:
Finally the leaves and stalks bend all the way back, the upper surface of the leaf presses it's self against the mossy trunk and a new plant begins. At least that's what it looks like.