about 3 mm. long and 1.1 mm. wide near the apex of 
the obovate-oblong basal portion, abruptly caudate above 
with the upper portion about 1.5 mm. long, 1-nerved. 
Lip pandurate-oblong, about 2 mm. long in the middle 
(including the short claw) and 1 mm. wide above and 
below the constriction, lightly retuse, provided at base 
with a pair of minute retrorse auricles, with the margins 
(except near the base and middle) long-fimbriate, with 
a pair of incurved fleshy thickenings at the center of the 
base. Column about 1.8 mm. long, broadly winged 
throughout, the wing being dilated toward the denticu- 
late apex which is retuse with irregularly cellular-ciliolate 
margins. 
Pleurothallis caudatipetala is similar to P. barbulata 
Lindl., but has very different petals. 
Junin: Chanchamayo Valley, at 1500 meters altitude, March 1930, 
Carlos Schunke 1307. (Tyre in Herb. Field Mus. No. 622342). 
Pleurothallis chamensis Lindley var. tenuis C. 
Schweinfurth var. nov. 
Planta et habitu graciliore et folio ad apicem angustato 
et flore tenuiore a specie differt. 
Plant epiphytic, slender, up to 10.5 em. tall (base of 
longest stem incomplete). Rhizome abbreviated, plant 
caespitose. Stem slender, angulate. Leaf ovate to ellip- 
tic, distinctly narrowed above to an obtuse minutely tri- 
dentate apex, broadly cuneate or rounded at the base, 
2.9-4.5 em. long, 1.4-2.4 em. wide. Inflorescences ab- 
breviated, arising from the base of the leaf. Flowers very 
similar to those of the species but of thinner texture, 
“dark maroon with yellow-tipped petal. ’’ 
Considering the great variability of Plewrothallis cha- 
mensis both vegetatively and florally, it seems advisable 
to recognize this collection, which appears outwardly so 
dissimilar, merely as a variety of that species. 
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