Bulbophyllum unicaudatum Schltr. var. xanthosphaerum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1913) 816
Type: Schlechter 20249 (holo B, lost)
Differs from the typical variety in the more distant pseudobulbs, oblong-ligulate petals, the lip not being constricted above the middle, with long ciliate margins, and the shorter anther. (After Schlechter, 1913)
Colours: Flower dark red. Lateral sepals with yellow appendages.
Habitat: Epiphyte in lower montane forest; 1000 m.
Flowering time in the wild: September.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-1927M.jpg.
Cultivation: Intermediate growing epiphyte.