tinct channelled petiole, elliptic to oblong-elliptic, up to 
4.6 em. long and 7 mm. wide, acute with a minutely 
tridenticulate apex, marginate, coriaceous. Inflorescen- 
ces one to five, arising from just below the leaf-joint, 
shorter than to slightly exceeding the leaf, loosely few- 
(up to 9-) flowered, generally arcuate in anthesis. Floral 
bracts short, infundibuliform, acute. Flowers small,mem- 
branaceous. Dorsal sepal ovate-lanceolate or ovate, acute 
or short-acuminate, concave, 5.8-7.9 mm. long, 4 mm. 
wide, 3-nerved, dorsally carinate (especially below). Lat- 
eral sepals connate near the base, lanceolate or narrowly 
lanceolate, oblique, 4.8—7.1 mm. long and about 2 mm. 
wide at base of the free portion, long-acuminate, con- 
spicuously 1-nerved, commonly with a short lateral sup- 
plementary nerve, carinate without, recurved at the apex. 
Petals much shorter than the sepals, oblong-obovate, 
2.9-4 mm. long and about 2.1 mm. wide, broadly round- 
ed above with more or less irregular margins, 1-nerved, 
slightly oblique. Lip small, recurved in natural position, 
when expanded ovate-oblong with the basal third slightly 
dilated, sessile at the rounded base, broadly rounded in 
front, 8-8.6 mm. long and about 2 mm. wide near the 
base, 1-nerved nearly to the apex and 8-nerved near the 
base; disc through the basal third with a pair of promi- 
nent fleshy keels which often have a tooth near the base 
and diminish toward the front. Column very short and 
stout with a conspicuous (more or less upcurved) sub- 
quadrate foot. 
Pleurothallis brevispicata appears to be allied to the 
Colombian P. lepanthoides Schltr., but differs in having 
longer narrower leaves, fewer-flowered racemes and larg- 
er flowers. It differs from the Guatemalan P. crucilabia 
Ames & Correll in having dissimilar petals and lip. 
Hvanvuco: Yanano, at about 1800 meters altitude, ‘““densely cov- 
ering small branches,’’ May 13-16, 1923, J. Francis Macbride 3838, 
[ 174 ] 
