Sigmatostalix unguiculata C. Schweinfurth sp. 
nNOv. 
Herba parva, epiphytica, caespitosa. Pseudobulbi ap- 
proximati, late patentes, ellipsoidei vel ovoidei, valde 
complanati, monophylli, vaginis foliiferis nonnullis utrin- 
que suffulti. Folia anguste oblonga vel oblongo-elliptica, 
apice rotundato oblique bilobulata, in sicco nitida et 
submembranacea. Inflorescentiae axillares, breves, lax- 
issime rariflorae. Flores parvuli. Sepala petalaque reflexa, 
membranacea, elliptico-lanceolata vel ovato-lanceolata, 
acuminata. Labellum perlonge unguiculatum; lamina 
profunde trilobata cum lobis lateralibus valde arcuato- 
porrectis, triangulari-linearibus et lobo intermedio pan- 
durato, subacuto. Columna gracillima, arcuata. 
Plant small, caespitose, epiphytic. Roots fibrous, 
flexuous, glabrous. Pseudobulbs ellipsoid or ovoid, ap- 
parently strongly complanate, monophyllous, about 1— 
1.5 cm. long, shining, rugose in the dried specimen, 
supported on each side by commonly three imbricating 
leaf-bearing sheaths. Leaves linear-oblong to oblong- 
elliptic, obliquely bilobulate at the rounded apex, con- 
duplicate at the narrowed base, up to 5.6 cm. long and 
8 mm. wide (few perfect blades present), submembrana- 
ceous, rather shining above, dull beneath. Inflorescences 
short, axillary, very remotely few-flowered. Flowers 
apparently secund, widely spreading. Pedicellate ovary 
filiform, about 8 mm. long. Flowers small. Sepals and 
petals reflexed, membranaceous, 3-nerved, with a dorsal 
keel near the apex. Dorsal sepal elliptic-lanceolate, about 
5-5.5 mm. long and 2 mm. wide, acuminate with con- 
duplicate upper margins, concave. Lateral sepals ovate- 
lanceolate, about 5-5.5 mm. long and 2 mm. wide, 
slightly oblique, acuminate, apiculate. Petals obliquely 
ovate-elliptic, about 4.8 mm. long and 2.2 mm. wide, 
acuminate. Lip long-unguiculate with the lamina abrupt- 
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