The wxact species would be impossible without flowers, but it looks to be from the section Holochrysa. This includes D. fimbriatum, atavus, clavatum, etc. They all like good moisture and fertilizer in the growing season (Spring to Autumn) and a dryer (still lightly water!), cooler rest with much light in the Winter. Although they tend to bloom right after the rest period, some may bloom almost any time. During active growth they appreciate warmth, but are otherwise cool (Winter) to warm (Summer) growing in their natural habitat and, thus, not too picky.
For more general information you can look through these links.
IOSPE PHOTOS
The only species I would eliminate from this list is D. pulchellum, which has much heavier canes than your plant. At first glance it reminds me of D. denneanum or fimbriatum.
another group to consider is the Calcarifera, which look very similar, but you typically see left-over inflorescences. The leaves are less leathery as the Holochrysa. They are closely related.
Dendrobium I.D.
Linear Mode
