TROPICAL AMERICAN ORCHIDS 
dorsale simile. Petala lanceolata, acuminata. Labellum 
lanceolato-ovatum, obtusum. Columna brevis, basi crasse 
dilatata. 
Plant large, lower portion missing. Stem up to 9.5 cm. 
tall, 2 mm. in diameter, monophyllous, glabrous. Leaf lan¬ 
ceolate-ovate, lightly cordate-clasping at the sessile base, 
16.2-18 cm. long, 6.65-7 cm. wide below the middle, above 
long-acuminate to a more or less oblique tip, erect-spreading, 
many-nerved, subcoriaceous. Inflorescence one or two flaccid 
racemes which slightly surpass the leaf in length. Peduncle 
below the raceme about 5.5 cm. long, clasped at the base 
by an elongate conduplicate lanceolate sheath. Raceme very 
loosely flowered, 9.4 to about 15.2 cm. long, flowers 6-13 mm. 
apart. Floral bracts very small, infundibuliform, membra¬ 
naceous. Pedicels including the ovary elongate, about 6-22.5 
mm. long, filiform, flaccid, flexuous, arcuate or reflexed. 
Flowers small, bilabiate. Sepals deeply concave, membra¬ 
naceous. Lateral sepals connate into a lamina which is 
broadly ovate, about 6.2 mm. long, 4-5 mm. wide when ex¬ 
panded, obtuse, 4-nerved, the inner pair of nerves carinate 
beneath. Dorsal sepal similar, ovate, 6.3 mm. long, about 
4.2 mm. wide when expanded, acute, 3-nerved. Petals lan¬ 
ceolate, somewhat sigmoid in outline, 5.45 mm. long, about 
1.2 mm. wide near the base, long-acuminate, 2-nerved, with 
one nerve much dilated at the apex, margins erose-den- 
ticulate. Labellum lanceolate-ovate, about 3.9 mm. long, 
2.5-3 mm. wide near the base, obtuse, 3-nerved, the ter¬ 
minations of the nerves dilated and thickened, a large 
fleshy thickening near the base. Column minute, stout, dor- 
sally about 2.4 mm. long; anterior lower portion dilated, 
fleshy, and papillose. 
The nearest ally of Pleurothallis longipedicellata is 
P. dentipetala Ames, which has smaller leaves and broader 
petals. In habit it resembles P. Rowleei Ames, while the 
form of the petals is similar to that of the much smaller 
P. cucullata Ames. 
Costa Rica, Estrella, C. H. Lankester 792, March 
27, 1924. “Semi translucent purplish—densely leaved plant. 
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