NEW OR NOTEWORTHY ORCHIDS 
Epiphytic herb, with the inflorescence up to 7 cm. tall, 
acaulescent. Roots coarse, white, with white villi. Leaves 
equitant, up to 4.5 cm. long, about 4 mm. wide, linear- 
oblong, acute or obtuse, very fleshy, rigid when dry, articu¬ 
lated to persistent sheaths, arranged like the ribs of a fan. 
Sheaths about 5 mm. long. Peduncle including the raceme 
up to 6.5 cm. long, bracteose and floriferous nearly to the 
base, longitudinally alate, otherwise smooth. Bracts of the 
inflorescence distichous, 1.5 mm. long, the lowermost ones 
being the longest, rigid, acute, spreading, clasping the rachis. 
Pedicel and ovary up to 4 mm. long, smooth. Flowers ten 
or more, crystalline white with a green callus on the label- 
lum. Lateral sepals 2 mm. long, 1.5 mm. wide near the tip, 
obovate, apiculate, conspicuously carinate through the 
middle on the dorsal surface, strongly concave, deflexed 
and bent sharply backward. Dorsal sepal 2 mm. long, sim¬ 
ilar to the laterals, strongly concave, subhemispherical. 
Petals 3 mm. long, 3 mm. wide near the tip, flabellate. 
Labellum 6 mm. long, about 3 mm. wide near the tip, 2 mm. 
wide near the middle, gradually dilated near the tip, abruptly 
acute, somewhat concave in front of the conspicuous bilobed 
or disc-like callus which seems to arise from the base of the 
column. Callus 2 mm. long, having the appearance of a 
circular disc or sometimes divided through the middle, 
minutely papillose on each side near the base. Column 
characteristic of the genus; rostellum 4 mm. long. Caudicle 
of the pollinia 4 mm. long. 
Allied with Ornithocephalus Elephas Reichb. f. which 
differs in having a navicular labellum with a very dissimilar 
termination. 0. falcatus Focke is another close ally, but 
different in the petals and labellum. 
Costa Rica, Las Concavas, C. H. Lankester 368. Flow¬ 
ers crystalline white, crest of lip green. On willow trunks, 
6-8 feet from the ground, hanging downward. 4700 feet 
altitude. (Type in Herb. Ames No. 22844.) 
