Dendrobium sanguinolentum
SPECIES
A Malaysian, Thai, Sumatran and Bornean [Philippines?] species found in lowland and hill forests on roadside trees at altitudes of sealevel to 600 or 900 meters as a medium to large sized, warm, pendent growing epiphyte with purple, thick, horizontal to pendulous, cylindrical stems carrying many, evergreen, reddish or purple in youth, maybe deciduous leaves that have purple veined leaf sheaths and flowers in the summer and fall on a short to 1 to 1 1/2" [2.25 to 3.75 cm], raceme with a densely few to several [2 to 6], waxy, longlasting flowers arise from the nodes at the apex of leafless canes.
Fertilizer can be reduced through all the winter months but water should stay more constant with only a drier period for 1 to 2 months.
D kentrochilum is often cited as a synonym but it differs in the broader leaves and a lip with a deeper incision between the hypochile and the orbicular epichile as well as 1 to 2 flowered inflorescence.
Many authorities put D cerinum as a synonym of D sanguinolentum but I along with Cootes [1999] and Wood [2006] keep it separate pending more information.
I do not see how, if the determination of D cerinum as D sanguinolemntum iscorrect, #1 there are no lobes to the lip, this one has an entire apical lip and D sanguinolentum has a bilobed apical lip. More research needed here.