sepalis lateralibus similia sed minora. Labellum erectum, 
Jateraliter visum Jeviter sigmoideum, supra medium levi- 
ter sed distincte trilobatum; pars basalis profunde con- 
‘ava, Intus medio carina anguste oblonga tricarinata 
ornata; pars terminalis incrassata, ovata vel oblonga, 
subacuta. Columna brevis, leviter arcuata, in pedem 
paulo longiorem producta. 
Plant variable, medium-sized to large. Rhizome ap- 
parently abbreviated, woody. Roots numerous, fibrous, 
slender, glabrous. Pseudobulbs approximate, strongly 
complanate, cylindric, unifoliate at the oblique apex, 
finely striate-rugose in the dried specimen, up to 6.4 em. 
high, surrounded and in youth entirely concealed by 
several distichous imbricating sheaths of which the apical 
pair is often leaf-bearing. Leaf petioled; lamina elliptic- 
oblong to narrowly lanceolate-oblong, acute, cuneate 
below, more or less coriaceous, with the mid-nerve sul- 
cate above and conspicuously carinate beneath, 10 to 
over 32 cm. long, 1.6-4.1 em. wide; petiole condupli- 
‘rate, about 1.7 cm. long. Scapes lateral, basal, numerous, 
1-flowered, commonly much shorter than the leaves, sub- 
erect to lax; peduncle filiform, about 18.5 em. or less 
long, mostly concealed by eight or less tubular ventri- 
cose sheaths of which the uppermost is up to 2.8 em. 
long; pedicellate ovary slender, somewhat exceeded by 
a bract which is similar to the sheaths of the scape. Flow- 
er medium-sized, white, often with the lip pale rose to 
violet at the base. Dorsal sepal narrowly lanceolate- 
oblong, acute, concave at the base, with revolute mar- 
gins, 2.5-2.7 cm. long, 6-8 mm. wide near the base when 
expanded, dorsally carinate above the middle. Lateral 
sepals obliquely oblong-lanceolate or triangular-oblong, 
acute or apiculate, dorsally carinate near the apex, form- 
ing with the column-foot a prominent mentum, 2.5-2.8 
cm. long, 8-9 mm. wide at the base. Petals similar to 
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