ORCHIDACEAE QUAEDAM AMERICANAE 
from about the middle, callose-thickened on each side near 
the middle, the round tip of each callus extending nearly to 
the margin. Column 3 mm. long. 
Similar to Pleurothallis Lindenii Lindl., but with 
smaller flowers, and rotund labellum. In habit not unlike P. 
strobilifera Lehm. & Kranzl., but with very dissimilar flowers. 
Venezuela, State of Aragua, Colonia Tovar and vi¬ 
cinity, //. Pittier 10004, December 26, 1921. Epiphyte. 
2100-2200 meters altitude. (Type in Herb. Ames No. 
22496.) 
Pleurothallis poasensis Ames sp. nov. Caules sec- 
undarii caespitosi, monophylli. Folium oblongo-ellipticum, 
racemo brevius. Flores mediocres. Sepala lateralia libera, 
lineari-triangula, caudata. Sepalum dorsale simile. Petala 
oblonga, uninervia. Labellum panduratum, trinervium, 
ecallosum. Columna gracilis, ad apicem in laminam acutam 
producta. 
Roots fibrous, whitish, smooth, 7 cm. long. Secondary 
stems caespitose, 5-9 cm. long, slender, about 1 mm. in 
diameter, paucivaginate, the sheaths elongated, closely op¬ 
pressed and soon disappearing. Leaf 5-9 cm. long, up to 
1.9 cm. wide, elliptic-oblong, obtuse, contracted at base into 
a rigid petiole, pale yellow when dry, coriaceous. Peduncle 
solitary, arising from a short coriaceous sheath, including the 
raceme 10-12 mm. long, with several closely oppressed 
sheaths. Raceme about 7 cm. long, bearing as many as ten 
flowers. Floral bracts 2-3 mm. long, infundibuliform, acute. 
Lateral sepals about 9 mm. long, free nearly to the base, 
1 mm. wide below the middle, 3-nerved, linear-triangular, 
tapering gradually to a subfdiform tip. Dorsal sepal 
similar, 7.6 mm. long, 3-nerved, about 1 mm. wide near the 
base. Petals 3 mm. long, 1 mm. wide, oblong, conspicuously 
1-nerved along the middle, tapering abruptly into an acute 
tip. Labellum ecallose, 3 mm. long, 1.5 mm. wide below the 
middle when spread flat, panduriform-lanceolate, obtuse, 
conspicuously 3-nerved, the nerves somewhat thickened- 
carinate. Column slender, 2.5 mm. long, prolonged behind 
the anther into a triangular subulate membrane. 
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