Pleurothallis semipellucida Reichb.f. var. grand- 
iflora C. Schweinfurth var. nov. 
Herba floribus multo majoribus et comparate laxiori- 
bus a specie differt. 
Plant large, tall, epiphytic. Stem suberect, about 88.3 
em. high. Leaf solitary, widespreading, ovate, appar- 
ently acute (imperfect at the apex), broadly rounded or 
subcordate at the sessile base, about 18.7 cm. long and 
8.5 cm. wide. Inflorescences two, nearly twice as long 
as the leaf, flexuous-suberect, rather loosely many-flow- 
ered, clasped at the base by an inconspicuous condupli- 
cate spathe about 3.5 cm. long. Flowers secund, bilabi- 
ate, much larger than those of the typical form, yellow, 
with widely spreading segments. Dorsal sepal elliptic- 
ovate, acute, 3-nerved, about 1.1 cm. long and 5.8 mm. 
wide. Lateral sepals entirely connate into a suborbicular- 
ovate deeply concave acute lamina which is about equally 
long with the dorsal sepal and about 7.4mm. wide when 
expanded. Petals linear, acuminate, very fleshy, lightly 
incurved, about 9.5 mm. long and 0.9 mm. wide. Lip 
very small, transverse, abruptly reflexed in the middle, 
lightly 8-lobed, about 2.5 mm. long and 5 mm. wide; 
lateral lobes obliquely semiorbicular, convex, spreading ; 
mid-lobe semiorbicular-ovate, abruptly acute or mucro- 
nate. Column very short and stout, dilated above and 
below. 
This concept is vegetatively closely similar to typical 
Pleurothallis semipellucida, but differs rather strikingly in 
having somewhat looser racemes of much larger flowers. 
Cuzco: Prov. of Convencién, “‘alturas de Pintobamba,’’ at 2700 
meters altitude, March 2-3, 1943, C. Vargas 3243 (Type in Herb. 
Ames No. 60044). 
Pleurothallis tenuifolia C. Schweinfurth sp. nov. 
Herba epiphytica, caespitosa, mediocris. Caules ap- 
proximati, graciles, unifoliati, vaginis tubulatis arctis 
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