Dendrobium sulcatum

This is a medium sized Dendrobium found in Assam, eastern Himalayas, Myanmar, Thailand, Laos and south central China at altitudes of 500 to 1000 meters.  I bought this plant from Woon Leng orchid nursery about a year ago and recently, it started blooming.  The plant has pseudobulbs which are flattened but yet quite plumb and the plant itself has a kind of rigid feel which is very unlike the similarly flattened Dendrobium lamellatum.