Bulbophyllum masonii (Senghas) J.J.Wood, Kew Bull. 41 (1986) 821
Basionym: Cirrhopetalum masonii
Plant caespitose. Pseudobulbs crowded, in outline truncate-ellipsoid, in cross section subrotund, c. 6 by 3 mm; 1-leaved. Leaves narrowly ellipsoid, to 45 by 1.2 cm. Inflorescence 1-flowered, pendulous from the base of the pseudobulb; peduncle very thin, 7 cm long. Floral bract membranous, 0.4 cm long, enclosing and densely appressed to the ovary. Median sepal 10 by 0.8 cm; base narrowly elliptic; top part filiform, slightly twisted; margins hairy except to base and the apex. Lateral sepals forming a hardly significant mentum, connate to the apex, as long as the median one but base only 0.3 cm wide, margins glabrous. Petals 2.5 cm long; base 0.25 cm wide; margins distinctly hairy. Lip mobile, with a very narrow elastic ligament attached to the column-foot, filiform, 1.5 cm long; base small pandurate, on each side with two small, broadly rounded, 0.1 by 0.05 cm big lateral lobes; above the base with a small stretch of short hairs; the long top part densely tomentose-pilose. Column low, thick, somewhat rounded, 0.13 cm tall; stelidia two curved-erect, filiform; column-foot distinct, 0.15 cm long. Ovary 0.8 cm long. (After Senghas, 1978)
Colours: Leaf green or reddish. Median sepal in the broad basal part purple, the narrow top part greenish. Lateral sepals similar coloured. Petals purplish red. Lip greenish; the short hairs above the base wine-red. Column white; stelidia at the top wine red.
Habitat: Epiphyte in montane forest; 2000-2700 m.
Flowering time in the wild: April, August.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-1110M.jpg.
Cultivation: Cool growing epiphyte, requires shaded position.