Type: Colombia; Dept. Cauca, Madero, s.n. 
Observation: The plants of this species are readily separated 
from O. Harlingii by the absence of sheaths and nodes along 
the growths. The lip of the flower is longer than wide, and in the 
type-flower it is more or less oblong-pandurate with an auricu- 
late base. It measures up to 12 mm. long and 8 mm. across the 
midlobe, but may be somewhat wider. The callus, as recon- 
structed from the type-specimen, is tuberculate and it is dif- 
ficult to explain Lindley’s interpretation of it being bilamellate. 
The sepals and petals are clawed, elliptic-obovate, up to 11 
mm. long and 5 mm. wide; the petals are less prominently 
clawed. The column is up to 5 mm. long with small, quadrate, 
serrated wings; the clinandrium is conspicuously cucullate, 
truncate. The pedicellate ovary is up to 18 mm. long and the 
floral bracts are up to 4mm. long. The leaves are ovate, acute, 
up to S cm. long and 1.5 cm. wide. The somewhat compressed 
pseudobulbs are oblong-ovate and rarely more than 2.5 cm. 
long. The inflorescence is usually several-flowered. 
DISTRIBUTION: Colombia. Ecuador. 
ACKNOWLEDGMENTS 
To Dr. Peter Taylor, the Orchid Herbarium, Royal Botanic 
Gardens, Kew, England, I am indebted for permission to exam- 
ine type-material. I wish to express my appreciation also to Dr. 
R. Lucas Rodriguez of the University of Costa Rica for his 
constructive comments on the morphology of species referable 
to this Section, to Dr. Leslie A. Garay of the Orchid Herbarium 
of Oakes Ames for his continuing guidance, and to Miss Ger- 
trude Ahern for her secretarial assistance. 
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