NEW OR NOTEWORTHY ORCHIDS 
the more slender sepals, elongated narrowly lanceolate 
petals and different labellum. 
Costa Rica, C. H. Lankester. (Type in Herb. Ames 
No. 22859 from a plant cultivated in Hort. Bot. Reg. Kew. 
August 3, 1922. Duplicate from the type plant in Herb. 
Kew.) 
Pleurothallis dentipetala Rolfe, nomen ex sched. 
Caules secundarii elongati, vaginati, monophylli. Folium 
elliptico-lanceolatum, sessile, acuminatum. Pedunculus 
cum racemo folium excedens. Racemus gracilis, plus 
minusve quindecimflorus. Sepala lateralia usque ad apicem 
cohaerentia, laminam suborbicularem formantia, leviter 
bicarinata. Sepalum dorsale valde concavum, subacutum. 
Petala oblanceolata, margine denticulate, binervia, nervis 
clavato-incrassatis. Labellum sagittatum, obtusum, tri- 
nervium, nervo medio clavato-incrassatum. Columna ab- 
breviata, apice integra. 
Secondary stems 8 cm. or more long, erect, about 1.5 
mm. in diameter, monophyllous. Leaf 8-9.5 cm. long, 
2.7-3.3 cm. wide, elliptic-lanceolate, acuminate, sessile. 
Peduncle with the raceme 11-13 cm. long. Raceme about 
7 cm. long, slender, about 15-flowered. Bracts of the inflo¬ 
rescence about 2 mm. long, infundibuliform. Lateral 
sepals about 5 mm. long, coherent, forming a suborbicular 
concave entire lamina 3.5 mm. wide which is slightly bi- 
carinate on the dorsal surface. Dorsal sepal 4.5 mm. long, 
strongly concave, elliptical when spread out, 3-nerved, 
subacute. Petals 4 mm. long, 1.5 mm. wide, oblanceolate, 
subacute, with the margin rather evenly dentate, 2-nerved, 
with the nerves clavate-thickened at the tip. Labellum 
up to 3 mm. long, 1.5 mm. wide above the short claw, 1 mm. 
wide below the tip, sagittate, obtuse, auricles retrorse and 
obtuse, 3-nerved with the middle nerve terminating in a 
claviform thickened tip. Column abbreviated, 1.5 mm. long, 
conspicuously dilated toward the summit, entire. 
In the structure of the flowers not unlike Pleurothallis 
Rowleei Ames, but very different in habit and in the elon¬ 
gated inflorescence. 
