subtending each flower; sheaths tridentate at the tip, a- 
bout 2 em. long. Stems slender, about 3 mm. in diameter, 
partly concealed by elongated tubular sheaths. Sheaths 
2—6.2 em. long, nervose when dry, finely asperate, closely 
appressed, obtuse or subacute, brown-annulate at the 
base. Leaves 6-8 em. apart, 7-nerved; lamina 4—14.5 em. 
long, 1-8.2 em. wide, elliptic-lanceolate, tridentate at 
the tip, continued below into elongated finely asperate 
closely appressed tubular sheaths. Inflorescence, with its 
subtending conduplicate bracts, arising in the axil of the 
uppermost leaf, 2-flowered, with the flowers opening in 
succession. As the second flower expands the first one is 
entirely withered,the remains of the perianth and column 
surmounting the elongate capsule. Lateral sepals 3.7 cm. 
long, about 8 mm. wide, pale green, narrowly lanceolate, 
conspicuously apiculate, lightly carinate on the outer sur- 
face along the median nerve. Dorsal sepal pale green, 
equal to the laterals and similar. Petals pure white, about 
83.5 cm. long, 6 mm. wide, oblong, subacute, apiculate. 
Labellum 8 em. long, 1.5 em. wide, elliptic-oblong, ob- 
tuse, margin above the middle conspicuously folded or 
plaited in small regular undulations, unequally and in- 
conspicuously crenulate, but not at all fringed or deeply 
dentate, shortly bicallose at the base, each callus bifurcate 
or trifurcate, with one of the divisions extending along 
the dise almost to the apex of the labellum and becoming 
conspicuously raised into a sinuate keel above the middle, 
in addition five of the nerves become similarly carinate, 
and several others become shortly carinate or bear con- 
spicuous flattened protuberances near the margin on the 
distal portion of the disc. Column about 1.6 em. long, 
lightly winged on the sides, with two falcate erect retrorse 
terminal lobes or teeth. Capsule slender, elongated, up 
to 9 em. long when mature. 
Nm 
[2] 
