NEW OR NOTEWORTHY ORCHIDS 
Pleurothallis sigmoidea A. cS: S. sp. nov. Herba epi- 
phytica, P. monstrabilem in mentem revocans. Rhizoma 
repens. Caules secundarii brevissimi, approximati, mono- 
phylli. Folium oblongum, vel lineare, in siccitate saepe 
conduplicatum, carnosum ut videtur. Inflorescentiae laxe 
racemosae, folia multo superantes. Sepala lateralia ovato- 
lanceolata, in dorso valde carinata. Sepalum dorsale ellip- 
ticum, ecarinatum, valde concavum. Petala lanceolata, in 
basi biauriculata. Labellum longe unguiculatum, lanceo- 
latum, sigmoideum. 
Plant forming dense tufts or mats. Rhizome creeping, 
entirely concealed by loose scarious imbricating sheaths. 
Roots very numerous, flexuous, fibrous, glabrous. Stems 
very short, about 8 mm. long or less, approximate, mono- 
phyllous, entirely concealed by loose imbricating scarious 
sheaths. Leaf elliptic-oblong to linear, erect, commonly 
conduplicate, apparently fleshy in the living state, 1-3.6 
cm. long, about 4-6 mm. wide when spread out, acute, ses¬ 
sile. Scapes solitary, much exceeding the leaves, up to 
10.1 cm. long, filiform, with 1-3 remote tubular sheaths. 
Raceme loosely few-flowered, rachis more or less fractiflex. 
Foral bracts infundibuliform, shorter than or subequaling 
the pedicels. Sepals minutely papillose on the outer sur¬ 
face, minutely ciliolate. Lateral sepals ovate-lanceolate, 
7.5-9.9 mm. long, 3.6-4.8 mm. wide, oblique, acute, mu- 
cronate, dorsally carinate with a high keel which is more or 
less pubescent and denticulate, 3-nerved, usually with an 
additional indistinct outer nerve. Dorsal sepal elliptic, cu- 
cullate, 6.9-9.5 mm. long, 4-6 mm. wide, acute or obtuse, 
5- to 7-nerved. Petals lanceolate, 5-5.6 mm. long, with a 
minute rounded anricle on each side of the base, obtuse, 
margins irregularly serrulate, oblique, 1-nerved. Labellum 
simple, lanceolate, strongly sigmoid in natural position, long 
unguiculate; claw about 2 mm. long, oblong, upcurved or 
angled, with a minute suborbicular auricle on either side of 
the base, fleshy; lamina very fleshy, when extended 5-6 mm. 
long, about 3 mm. wide near the base, broadly rounded at 
the apex, margins denticulate in the basal portion. Column 
36 
