TROPICAL AMERICAN ORCHIDS 
clasping leaf-sheaths which are elongate tubular and striate 
in the dried specimen. Leaves lanceolate-elliptic, 12.25-17.9 
cm. or more long, 2.05-3.45 cm. wide, acnminate above, 
cuneate-narrowed to a sessile base,nervose, coriaceous, many- 
nerved with seven nerves conspicuous on the under surface, 
plicate with revolute margins in the dried state. Flower ap¬ 
parently solitary, small for the genus, the pedicellate ovary 
invested by several imbricating sheaths. Sepals rather fleshy 
in texture. Lateral sepals elliptic-oblong, about 2.5 cm. 
long, 6.9 mm. wide, acute, prominently mucronate, lightly 
oblique, 7-9-nerved. Dorsal sepal linear-oblong, abruptly and 
prominently mucronate, 2.6 cm. long, 5.3 mm. wide, with 
seven prominent nerves. Petals oblanceolate-oblong, 2.35 
cm. long, 5.5 mm. wide above the middle, acute, apex mu¬ 
cronate, 5-nerved, the lateral nerves branching below. Label- 
lum in natural position tubular-involute near the base, when 
expanded broadly elliptic-oblong or quadrate-oblong, about 
2.3 cm. long, 1.15 cm. wide above the middle, entire, retuse, 
apiculate at the broadly rounded apex, anterior margins 
strongly crisped; lamina with two prominent keels, which 
are much thickened at their very base, extending from the 
base nearly to the apex of the lamina, supplemented near its 
longitudinal middle by two short keels on each side of the 
central pair and between the central pair by three keels 
which extend nearly to the apex,—all of the keels abruptly 
increasing in altitude toward their fleshy crisped and wavy 
anterior portion. Column slender, about 1.35 cm. long, apex 
3-lobed, with the lateral lobes linear-falcate and incurved, 
the middle lobe suborbicular and strongly galeate. 
There are two species allied to Sobralia mucronata, 
namely, S. luteola Rolfe, which differs in having larger flow¬ 
ers and fimbriate-pilose nerves on the labellum, and S. corazoi 
Ames, which has much broader leaves and a different labellum. 
Costa Rica, San Carlos, C. H. Lankesier 764, March 
1923. “Flowered in cult. Cartago, March 1924. Flower 
greenish white, frilled edge of lip white, lines of pleated crest 
brown red.” (Type in Herb. Ames No. 28297.) Alcohol 
material of this species from which the description of the 
flower was drawn bears the number 685. 
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