Bulbophyllum khasyanum Griff., Not. Pl. Asiat. 3: 284 (1851). (syn: Bulbophyllum bowringianum Rchb.f.; Bulbophyllum conchiferum Rchb.f.; Bulbophyllum cylindraceum var. khasyanum (Griff.) Hook.f.; Bulbophyllum gibsonii Lindl. ex Rchb.f., nom. nud.; Phyllorkis conchifera (Rchb.f.) Kuntze);
E. Himalaya to China (Yunnan) and Indo-China as per WCSP;
Assam; China South-Central; East Himalaya; Thailand; Vietnam as per Catalogue of Life
Bulbophyllum cylindraceum Wall. ex Lindl. : 6 posts by 2 authors. 4 images- 6 to 7 mb each.
Location: Kalimpong, WB, India
Date: 28 November 2019
Habitat: Wild / Cultivated
I am not sure about the id of this plant. B. cylindraceum will have a large bract just before the flower starts. I dont see that in your image. I doubt this is khasyanum.
Sorry, I gave him wrong name by mistake earlier. B. cylindraceum will have large bract before flowers and B. khasyanum will not have. Hence this is khasyanum.
It was my mistake earlier. But, now I assume I am correct. I checked the type.
I think both were lacking large bract.
Hence both images should have been Bulbophyllum khasyanum.