TROPICAL AMERICAN ORCHIDS 
long, up to 1.35 cm. wide, sessile, gradually narrowed at both 
ends, rigidly coriaceous, finely striate-rugose with revolute 
margins when dry, the mid-nerve conspicuously carinate 
beneath. Inflorescence a cluster of short few-flowered ra¬ 
cemes, 1.5-2 cm. long, subtended by a scarious evanescent 
sheath. Floral bracts minute, infundibuliform. Flowers 
small, 5.9 mm. long; perianth segments subconnivent. Lat¬ 
eral sepals obliquely ovate-lanceolate, acute, connate into a 
lamina which is bidentate at the apex; lamina 5 mm. long, 
5.5 mm. wide when expanded, each sepal 3-nerved and 
deeply carinate in the middle, forming a prominent mentum 
with the column-foot, anterior free half of each sepal somewhat 
fleshy-thickened. Dorsal sepal oblong-lanceolate, very con¬ 
cave, about 6 mm. long, 2.1 mm. wide when expanded, acute, 
the apical third strongly fleshy-thickened, 3-nerved, bluntly 
1-keeled on the outer surface. Petals minute, cuneate- 
spatulate, about 2.4 mm. long, about 1.6 mm. wide above, 
acutish, the apex broadly rounded and erose-denticulate, 
1-nerved, membranaceous. Labellum short, in natural posi¬ 
tion recurved and subconduplicate, simple with a short 
quadrate claw which is .9 mm. long; lamina when expanded 
pandurate-subquadrate, about 2.9 mm. long, 1.9 mm. wide 
above the middle, apex truncate and irregularly denticulate, 
3-nerved, the sides indistinctly carinate-thickened, a fleshy 
callus at the base. Column short, stout, dorsally about 2.3 
mm. long, apex truncate and lobulate-erose. Column-foot 
very broad. 
PleuTothallis decipiens very strongly suggests P. ca- 
chensis Ames and P. hondurensis Ames in vegetative char¬ 
acters, but the flowers are very different. 
Costa Rica, Arenal, Juvenal Valerio 68, July 13, 1923. 
600 metres altitude. (Type in U. S. Nat. Herb. No. 1169274.) 
Pleurothallis longipedicellata A. & S. sp. nov. Caules 
graciles, unifoliati. Folium lanceolato-ovatum, basi leviter 
cordatum, acuminatum, subcoriaceum. Racemi singuli vel 
bini, flaccidi. Flores parvi, longe pedicellati, pedicello fili¬ 
form!. Sepala valde concava, bilabiata. Sepala lateralia 
omnino coalita, lamina late ovata, extus bicarinata. Sepalum 
27 
