This variety diverges from the type in having the in- 
florescences much longer than the leaf, smaller flowers 
with narrower segments and a more ovate lip. 
Hvuanuco: Yanano, at about 1800 meters altitude, in patches on 
humus, May 18-16, 1923, J. Francis Macbride 3849 (Tyre in Herb. 
Ames No. 60876). 
Pleurothallis tenuifolia C. Schweinf. var. longi- 
sepala C. Schweinfurth var. nov. 
Herba mediocris, caespitosa, caulibus gracilioribus et 
foliis angustioribus et sepalis longioribus a specie differt. 
Plant medium-sized, caespitose, epiphytic, with an 
abbreviated rhizome. Stems approximate, numerous, 
unifoliate, very slender, up to 11 cm. long, provided 
with two or three close, tubular, evanescent sheaths. Leaf 
erect or spreading, narrowly linear, abruptly obtuse to 
subacute with a minute apicule, gradually narrowed be- 
low to a subpetioled base, the margins being conspicu- 
ously revolute, up to 18.5 cm. long and 5 mm. wide in 
the dried specimen. Inflorescences commonly solitary 
(sometimes the remnants of four peduncles are present), 
lax or nodding, loosely several- to many-flowered almost 
to the base, markedly shorter than the leaf, up to about 
9cm. long. Flowers yellowish white. Sepals free, spread- 
ing above, finely papillose-pubescent within, 3-nerved. 
Dorsal sepal lanceolate-linear, concave below, about 20 
mm. long and 2 mm. wide near the base. Lateral sepals 
very similar, lightly oblique. Petals much smaller than 
the sepals, cuneate-oblong, subacute, lightly oblique, 
about 4mm. long and 1.8 mm. wide above. Lip lightly 
recurved in natural position, oblong-oblanceolate, obtuse 
at the apex, gradually narrowed toward the base, about 
5 mm. long and 1.8 mm. wide above, lightly bicarinate 
near the middle. Column very small, shorter than the 
petals, wing-dilated above, denticulate at the apex, about 
3 mm. high at the back. 
