| Dendrobium Chaopraya to the best of my knowledge is a blue fragrant den Phalaenopsis type. It is grown in Hawaii and Thailand as cut flowers.
The long ridges in the canes (I assume what you are calling stems are the canes on which leaves grow - stems usually refers to flower stems) are very common in these orchids and only newly growing canes will be full and plump. Moving the plant from the nursery to your home stresses it somewhat but the ridging in the canes would occur anyway but probably not as fast. It usually happens after flowering.
If the plant is in flower you should see new growth starting 4-6 weeks after the plant drops its last flowers. I always judge the health of a plant by the condition of the new growth. A lot of very fancy dens in my shade house look a lot worst than what you describe, but they are healthy.
Enjoy the plant.
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jerry  |