ly deflexed; claw elongate, narrowly linear, about 5 mm. 
long, fleshy, 5-nerved; lamina abruptly 3-lobed, cordate 
at the base with the lateral lobes abruptly arcuate-spread- 
ing then porrectly inflexed, triangular-linear, fleshy-thick- 
ened, densely pubescent; the anterior margins of the 
oblique bases of the lobes pass into a fleshy ovate-triangu- 
lar bilobed callus which occupies the entire center of the 
lip; mid-lobe narrowly pandurate, I-nerved, about 2 mm. 
long with its dilated base concealed by the central callus, 
the narrower isthmus dilated into a transversely ovate- 
rhombic apical portion which is subacute with a dorsal 
subapical keel. Column slender, arcuate, gradually dilated 
above, with a prominent stigmatic orifice, about 4.8 mm. 
long in natural position. 
Sigmatostalix unguiculata is apparently unique in the 
genus by reason of its long, slender claw and its peculiar 
arcuate-porrect narrow lateral lobes of the lip. In some 
respects it suggests the Colombian S.minax Kriinzl. 
Costa Rica: epiphyte on fallen branch, vicinity of El General, 
Province of San José, at 975 meters altitude, flowers greenish, De- 
cember 19386, Alevander F. Skutch 3020 (Type in Herb. Ames No. 
55414). 
[ 56 | 
