If you have not yet seen my water culture method for orchid propogation or saving sick orchids I have posted a picture of a dendrobium keiki that I started a couple of months ago. As you can see lots of new root growth even new branches on old rotting roots that sustained it while the new growth started to develop.
Although I have not been successful with Phals I have not yet lost a Dendrobium. The second picture shows the mother plant, started the same way, now in S/H on top, that has gotten so large that I have to give away soon. The rest in that picture are all growing and blooming in water culture. I have to emphasize that I keep the ambient temperature above 70 degrees F. and I transfer the plants only to S/H so there is less of a shock.
I would like to point out that the only plant I have started from cuttings are Ludisia. With the Dendrobiums and Catts I take keikis or complete pseudobulbs with at least a new growth bud however undeveloped. If you are interested I have lot of posts on this method. Here is one of my summaries on the middle of the page.