CENTRAL AMERICAN ORCHIDS 
Stems more or less straggly, elongated, concealed by his- 
pidulous sheaths which are obliquely truncate and acute, 
leafy. Leaves up to 8 mm. long, about 3 mm. wide, nar¬ 
rowly elliptical, coriaceous, obscurely bilobed with a blunt 
apicule at the apex, narrowed to a sulcate base. Peduncle 
with the raceme about 2-5 cm. long, smooth. Raceme 2 cm. 
long, 7-10-flowered, flexuose. Bracts of the raceme in- 
fundibuliform, minute. Pedicel with the ovary about 
2.5 mm. long, very slender. Flowers sulphur-yellow when 
fresh, membranaceous, more or less hyaline when dry. 
Lateral sepals 5 mm. long, about 1.25 mm. wide at the base, 
linear-triangular, subcaudate at the tip, at base forming with 
the front of the column a distinct mentum, 1-nerved. 
Dorsal sepal 5.5 mm. long, narrowly lanceolate, acuminate, 
acute, 3-nerved, strongly concave at base. Petals 3 mm. 
long, 1 mm. wide near the middle, elliptic-lanceolate, obtuse, 
1-nerved. Labellum membranaceous, 3.5 mm. long, gradu¬ 
ally dilated from the base up to the middle, becoming 1.5 
mm. wide at this point where it is abruptly contracted to 
form the linear-oblong terminal half, 3-nerved up to the 
middle, 1-nerved beyond the middle, thickened at the tip. 
Column 3 mm. long including the foot, narrowed toward the 
middle, dilated at the summit. Pollinia two. 
In habit similar to Pleurothallis cabellensis Reichb. f., 
but very different from that species in the structure of the 
flowers. 
Costa Rica, Cedral, C. H. Lankester 352, July 28, 1919. 
Flowers sulphur-yellow (Ridgway), lip pale greenish yellow 
(Ridgway). Leaves spinach-green (Ridgway), becoming 
purple with age. 5000 feet altitude. (Type in Herb. 
Kew.); La Estrella de Caxlago, Lankester & Sancho 399, 
January 1923. (Herb. Ames No. 23157.); Cachi, Lankester 
80, November 1916. Flowers very pale yellowish green. 
(Herb. Kew.) 
Pleurothallis cerea Ames sp. nov. Caules secundarii 
elongati, validi, monophylli. Folium anguste ellipticum, 
basi conduplicatum, usque ad apicem attenuatum. Flores 
congest!, prope apicem caulis secundarii orientes. Sepala 
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