zome, l-leaved at the apex, not broadened above, with two 
or three imbricating tubular, scarious sheaths through the 
lower half. Leaf erect, fleshy-coriaceous, oblong-elliptic, 
subacute to obtuse, sessile at the broadly cuneate base, 
about 8.4 cm. long and 2.15 cm. wide. Inflorescences 
one or two, very short, axillary, loosely racemose and 
2-flowered above, subtended below by a small inconspic- 
uous spathe; rachis about 2 cm. or less long. Flowers 
dark yellow, bilabiate. Dorsal sepal narrowly oblong- 
lanceolate, acuminate, concave below with a fleshy re- 
curved upper portion, 3-nerved, about 1 cm. long when 
expanded and 2.7 mm. wide. Lateral sepals connate into 
a deeply concave ovate-lanceolate lamina which is nar- 
rowed to the shortly bidentate apex, 6-nerved, bluntly 
bicarinate on the back, and about 9.5 mm. long and 5.6 
mm. wide below when expanded. Petals much smaller 
than the sepals, oblong-lanceolate, acute, somewhat di- 
lated unequally on each side at the base, minutely ser- 
rulate above the middle, prominently 8-nerved with the 
lateral nerves carinate on the inner surface above the 
middle, about 5.1 mm. long and 1.4 mm. wide (slightly 
wider at the very base). Lip a little shorter than the 
petals, oblong-ovate, abruptly acute and apiculate, with 
obscurely denticulate anterior margins, broadly truncate 
at the base, fleshy, 8-nerved, about 5 mm. long and 2 
mm. wide, provided on each side below the middle with 
a small erect, porrect, triangular lobule which is serrate 
above; disc shortly bicarinate above the middle. Column 
slender, lightly arcuate, about 4.8 mm. high at the back, 
terminating in a deeply dentate wing and basally pro- 
duced into a short foot. 
This species is very similar to Pleurothallis ciliata 
Knowl. & Weste., but has a different 3-lobed lip. The 
bicarinate petals are remarkable, this character suggest- 
ing the specific name. 
[ 86 ] 
