serpentine, many-jointed with the internodes concealed 
by evanescent scarious sheaths, and producing numerous 
slender, fibrous roots. Secondary stems subapproximate 
to 1.5 cm. apart, gradually dilated and bialate upward, 
unifoliate at the apex, up to 9.8 cm. high, 1-jointed near 
the base, the node provided with a loose, tubular, eva- 
nescent sheath. Leaf when mature suborbicular (the 
young blades ranging from elliptic to broadly ovate), 
subacute to obtuse, or rounded with a minutely triden- 
ticulate apex, more or less cordate at the base, horizon- 
tally spreading, up to 4.4 cm. in greatest length and 4.2 
em. wide. Inflorescences several, fasciculate, 1-flowered 
(2- to 4-flowered in the type), the abbreviated peduncles 
embraced by a rather prominent, conduplicate, scarious 
sheath. Flower rather small, bilabiate. Dorsal sepal nar- 
rowly oblanceolate-oblong, acute and dorsally mucronate 
at the apex, about 9.2-10.8 mm. long and 2 mm. wide 
above, concave at the base, fleshy-thickened near the 
apex, 3-nerved. Lateral sepals connate into a suborbicu- 
lar-ovate lamina which is bidentate and forming a pair of 
sharp points at the apex, 6-nerved, about 7 mm. in great- 
est length and 6 mm. wide when expanded, concave at 
the base. Petals dwarf, spatulate-cuneate, rounded with 
a minutely irregular margin at the apex, 1-nerved, about 
3mm. long and 1 mm. wide above. Lip arcuate-recurved 
and about 4.8 mm. long in natural position, and 1.6 mm. 
wide, ovate-oblong in outline, rounded in front, biauricu- 
late below the cuneate base which is tubular-involute; 
disc 3-nerved, with a pair of fleshy, indistinct callose 
keels near the middle, the apical margin being minutely 
erose. Column slightly shorter than the petals, lightly 
arcuate, about 2.8 mm. high at the back, terminating in 
a trilobulate apex of which the narrow middle tooth is 
retuse, produced into a conspicuous, subequally long foot. 
This species appears to be most closely allied to Pleuro- 
[ 12 ] 
