Bulbophyllum cylindraceum

Bulbophyllum cylindraceum Wall. ex Lindl., Gen. Sp. Orchid. Pl.: 53 (1830) (syn: Bulbophyllum imbricatum Griff. ; Phyllorkis cylindracea (Wall. ex Lindl.) Kuntze)
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Nepal to China (Yunnan): Assam, China South-Central, East Himalaya, Myanmar, Nepal, Thailand, West Himalaya as per POWO;
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Common name: Cylindrical Bulb-Leaf Orchid
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Images and details from Jambey Tsering ji:

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References:
POWO  Catalogue of Life  Flowers of India