Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist, 1994

This always blooms with 2 flowers on each inflorescense. It has been seperated from the Bulbo genus and I believe it is now with Rhytionanthos due to the lateral sepals being fully united and the non exposed column. It is a southeast Asian species (java, Bali, Sumatra, Malaysia). This blooms on and off for me throughout the year.
The lateral sepals form a slipper-like structure and the dorsal sepal cups over the flower like a zootrophion does. The "dohickeys" are from the petals. The column and labellum lie within the flower. 
(Ron-NY, orchid talk member)

Homotypic Synonyms:

• Bulbophyllum mirum J.J.Sm., Icon. Bogor. 3: t. 216 (1906).
• Cirrhopetalum mirum (J.J.Sm.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1: 895 (1913).
• Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist, Nordic J. Bot. 14: 639 (1994). 

Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist

Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist

Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist

Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist

Rhytionanthos mirum (J.J.Sm.) Garay, Hamer & Siegerist

Collected from Gayo Lues regency, Aceh, Northen Sumatra by Mr. Cipta Kurniawan. Epiphyte at Pohon Kemiri. Flowering on 30 October 2012.

Explanation description
Bulletin de l'Institut botanique de Buitenzorg. ser. 2. v.9 : 95, 1913

Distribution:
Peninsula-Thailand to West Malesia
Borneo, Java, Lesser Sunda Islands, Sumatra
41 THA 42 BOR JAW LSI SUM

Lifeform: 
Pseudobulb epiphyte