Get a take-out food container with a transparent plastic lid that will hold the whole thing horizontally. Put some barely-damp sphagnum moss in the bottom. Lay the piece of Dendrobium cane on the surface and cover it. Put it where there is bright shade but no sun shining onto the plastic. Keep the moss barely damp. The plantlet should keep rooting and begin to grow. When it is a lot bigger, pot it up separately.
You can find threads here on Orchid Board of people doing this with Dendrobium canes.
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