NEW OR NOTEWORTHY ORCHIDS 
Costa Rica, C. H. Lankester. (Type in Herb. Ames No. 
22857 from a plant cultivated in Hort. Bot. Reg. Kew. 
September 1918. Duplicate from the type plant in Herb. 
Kew.) 
v/ 
Pleurothallis hamata Rolfe in Orch. Rev. 24 (1916) 
187, nomen. 
Caules secundarii abbreviati, vaginati, monophylli. 
Folium coriaceum, elliptico-oblongum, utrinque attenuatum, 
obtusum. Pedunculus gracilis, pendulus (?). Racemus 
laxiflorus, plus minusve quinqueflorus. Sepala conniventia. 
Sepala lateralia anguste navicularia, conspicue carinata, 
usque ad medium cohaerentia, trinervia, apice in cau- 
dam producta, hamata. Sepalum dorsale simile. Petala 
pandurato-spathulata, valde carnosa, abrupte acuta, tri¬ 
nervia, glabra, Integra. Labellum oblongo-lingulatum, 
supra medium ovatum, obtusum, papillosum, trinervium. 
Columna curvata, apice trilobata; lobis lateralibus trian- 
gularibus, denticulatis; lobo medio suborbiculari, antheram 
excedenti, denticulato. 
Secondary stems abbreviated, about 1.2 cm. long, pro¬ 
vided with tubular sheaths, monophyllous. Leaf 4 cm. or 
more long, about 1.1 cm. wide, elliptic-oblong, attenuated at 
both ends, coriaceous, obtuse. Peduncle with the few-flow¬ 
ered raceme 5 cm. or more long. Bracts of the inflorescence 
tubular, diaphanous. Ovary about 4 mm. long, dilated up- 
W'ard from a slender base, trialate, the wings extending 
along the sepals as deep keels. Flowers five or more, about 
1 cm. apart, yellowish green tinged or dotted with brown. 
Lateral sepals coherent to about the middle, up to 1.3 cm. 
long, about 4 mm. wide, oblong-lanceolate, navicular, 3- 
nerved, apical third caudate-hamate, on the dorsal surface 
conspicuously and deeply carinate along the middle, the 
keels 2 mm. deep decurrent on the ovary and extending 
from the base to the tip of each sepal. Dorsal sepal similar 
to the laterals, the keel decurrent on the ovary. Petals 4.5 
mm. long, 1.5 mm. wide near the tip, pandurate-spatulate, 
tapering abruptly above the middle to an acute tip, conspic¬ 
uously 3-nerved, fleshy. Labellum 5.5 mm. long, about 2 
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