ORCHID ACE AE QUAEDAM AMERICANAE 
From dried specimens it would seem that the lip when 
fresh is obscurely 3-lobed, when dry it assumes, when spread 
out, a distinctly pandurate outline. 
Similar in habit to Pleurothallis dolichopus Schltr., but 
with much smaller flowers. From P. stenopetala Schltr. it 
differs in its pandurate lip. 
Costa Rica, Volcan du Poas, H. Pittier 3054, July 31, 
1890. 2500 meters altitude. (Type in U. S. Nat. Herb. 
No. 579517.) 
Pleurothallis Rowleei Ames sp. nov. Caules secundarii 
elongati, monophylli. Folium oblongo-lanceolatum. Pe- 
dunculus elongatus. Flores in racemo laxo, paucifloro dis- 
positi. Sepala lateralia usque ad apicem connata. Petala 
oblongo-lanceolata, serrata. Labellum sagittatum, nervo 
medio incrassatum. 
Roots fibrous, 3-5 cm. long, smooth, whitish. Second¬ 
ary stems approximate. About 6 cm. tall, sheathed at base 
and near the middle, slender, rigidly erect, in dried specimens 
about 1 mm. thick, smooth. Sheaths tubular, about 2 cm. 
long, closely oppressed, soon passing away. Leaf oblong- 
lanceolate, about 5 cm. long, 1.5 cm. wide, coriaceous, acute, 
clasping the stem. Peduncle solitary, several-flowered, 
clothed at base with an ancipitous sheath, with the raceme 
about 4 cm. long, slender. Floral bracts somewhat in- 
fundibuliform, about 2 mm. long, much shorter than the 
pedicel. Pedicel and ovary about 6 mm. long, slender. 
Flowers about 6 mm. apart, five or more in number, 9 mm. 
long. Lateral sepals united to the tip forming an ovate sub¬ 
acute plate, which is 8.5 mm. long and 6 mm. wide. Dorsal 
sepal similar, 9 mm. long, 5 mm. wide. Petals oblong- 
lanceolate, about 8 mm. long, 2 mm. wide near the middle, 
coarsely serrate-dentate, acute, 3-nerved, the middle nerve 
rather prominent forming a carinate rib on the dorsal 
side. Labellum sagittate when the round-triangular basal 
lobes are spread out, 4 mm. long, 2.5 mm. wide near the 
base, abruptly contracted near the middle, the apical 
portion narrowly triangular, broadly acute, 3-nerved, the 
middle nerve clavate-thickened toward the end. Column 
11 
