hlutzow said:When I propagate cuttings by water, the cuttings get these little white tufts along the stem. I think those are pores for water intake until the roots develop.
What you describe sounds like root hairs, which aid in water absorption but neesh19 says the stem of her Hoya has what appears as round protrusions, growing from within and splitting the stem. To me, that sounds like possibly new roots pushing out along the stem.
I'm hoping neesh19 can upload a photo that has better focus so that maybe we can actually see the stem better.