Herba mediocris, inflorescentiis folio multo longioribus 
et petalis caudatis a specie differt. 
Plant epiphytic, with a creeping rhizome. Stems slen- 
der, unifoliate, 5-8 em. long, with two close, tubular, 
evanescent sheaths below, about 1 cm. or more apart. 
Leaf erect, oblong-elliptic to oblong-oblanceolate, acute, 
cuneate at the sessile base, up to 7.7 cm. long and 2 cm. 
wide. Inflorescences one or two, much exceeding the 
leaf, arcuate to lax, loosely several-flowered above, up 
to about 18 cm. long. Flowers rather small, bilabiate, 
greenish yellow striped with red-brown, glabrous. Dor- 
sal sepal narrowly lanceolate-oblong, acute and apiculate, 
about 14 mm. long and 2.8 mm. wide. Lateral sepals 
connate into a broadly oblong, apically bidentate lamina 
which is about as long as the dorsal sepal but twice as 
broad. Petals much smaller than the sepals, oblong- 
lanceolate, lacerate-dentate above the base (especially on 
the anterior margin), long-caudate above, about 7 mm. 
long. Lip shortly clawed, about 4 mm. long, lightly re- 
curved below; lamina oblong-ovate, obtuse, subtruncate 
at base, erose-denticulate, with a pair of remote obscure 
carinate thickenings below, about 2 mm. wide; claw 
short, with a fleshy U-shaped callus. Column small, arcu- 
ate, wing-dilated above, about 8 mm. high at the back. 
This concept differs from the variable Pleurothallis 
ciliata in having the inflorescences much surpassing the 
leaf and in having the petals long-caudate. 
Lorero: Vicinity of Iquitos, at 100 meters altitude, on living tree 
in clearing, November to December 1936, G. Klug 10013 (Tyrr in 
Herb. Ames No. 60889). 
Pleurothallis excisa C. Schweinfurth sp. nov. 
Herba major, epiphytica, caespitosa. Caules approxi- 
mati, unifoliati, vaginis pluribus tubulatis ornati. Folium 
breviter petiolatum, erectum; lamina oblongo-elliptica, 
apice obtusa, basi cuneata. Inflorescentiae saepissime 
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