Plant medium-sized, 28-83 cm. high, epiphytic. Rhi- 
zome abbreviated. Roots fibrous, glabrous, elongate. 
Pseudobulbs (only one present in each plant) small, 
complanate-cylindric, unifoliate, rugose-striate in the 
dried specimen, about 1.5 cm. long, surrounded and 
mostly concealed by several pairs of distichous closely 
imbricating sheaths of which the upper one or two 
sheaths are leaf-bearing. Leaves oblong or elliptic- 
oblong, broadly rounded and often apiculate (sometimes 
with slightly unequal lobes) above, more or less narrowed 
to acuneate conduplicate base, coriaceous, 8.2—-18.2 cm. 
long, 2.7-8.1 cm. wide. Inflorescence lateral, basal, gent- 
ly arcuate-spreading or deflexed; peduncle about 9.5 
cm. or less long, bearing several remote short tubular 
sheaths; raceme 21-22 cm. long, densely many-flowered. 
Floral bracts small, linear-triangular, spreading or re- 
flexed, much shorter than the pedicellate ovary. Flowers 
reflexed, small, bright green and white, glabrous through- 
out, with widely spreading membranaceous segments. 
Dorsal sepal strongly fornicate and concave, lanceolate- 
oblong or elliptic-oblong, about 5.6 mm. or less long in 
natural position and 2.2 mm. wide when expanded, ob- 
tuse, carinate above. Lateral sepals connate into a lan- 
ceolate-oblong tubular-concave lamina which is very 
shortly bilobed at the apex with a dorsal subapical mu- 
cro, about 5.5 mm. or less long and 1.8 mm. or less wide 
when expanded. Petals obliquely oblong, acute, about 
5 mm. long and 1.1 mm. wide. Lip adnate to the base 
of the column, about 3 mm. or less long, prominently 
clawed; claw narrow, about 1 mm. long, with a high 
central keel extending onto the middle of the lamina; 
lamina with conduplicate sides, recurved and sigmoid 
when viewed from the side, when expanded ovate-cor- 
date, acute or shortly acuminate, up to 2 mm. in greatest 
length, about 1.6 mm. wide. Column cylindric, abruptly 
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