Only afterwards did I notice something didn't look right with the canes. It turned out that the plant was dying, but it did produce a long beautiful spike of flowers, its swan song of sorts. Fortunately, all was not lost, as it also produced a keiki just before it died.
The keiki grew slowly, as most orchids do, and finally graced me with its lovely maiden blooms. Its purple and white two-toned flower is quite pleasing.
For the care of hard-cane dendrobiums, see previous post here.