ilia,tenuiora. Labellum in circuitu oblongo-ovatum, apice 
bidentatum ; discus carinis undulatis novem ornatus. Col- 
umna pergracilis, arcuatus, apice cum brachiis binis tri- 
angulari-lanceolatis. 
Plant stout, terrestrial or epiphytic. Stem present up 
to about 13.7 dm. tall, about 7 mm. in diameter near the 
base, woody, provided below with remote close tubular 
sheaths which are 8.3 cm. or less long and above by about 
four leaves. Leaves elliptic-lanceolate, up to 23.5 cm. 
long and 7.9 cm. wide, long-acuminate to an acute point, 
cuneate below, chartaceous when dry, with about eleven 
conspicuous nerves beneath. Inflorescence consisting of 
one or more showy flowers emerging from a cluster of 
erect imbricating bracts, the lowermost and largest bract 
consisting of an ovate-lanceolate blade about 8.2 cm. long 
which is articulated to a sheath about 8.8 cm. long. Flow- 
ers nodding before expansion, white with the lip striped 
with purple. Dorsal sepal connate with the lateral sepals 
at the base, lanceolate-oblong, free part about 4.5 em. 
long and 13 mm. wide, obtuse with a dorsal mucro, com- 
paratively firm in texture, 11-nerved. Lateral sepals sim- 
ilar to the dorsal sepal, elliptic-oblong, the free portion 
about 4.5 cm. long and 18 mm. wide, acute and mucro- 
nate, 11-nerved. Petals oblong-elliptic, obtuse, about 4.5 
em. long and 14 mm. wide, 9-nerved, thinner in texture 
than the sepals. Lip oblong-ovate in outline with the 
basal third round-dilated and the apex strongly bilobed, 
about 4.7 cm. long from the base to the tip of an apical 
lobule and 2.8 em. wide across the dilated basal portion. 
Dise provided near the base with a small fleshy trans- 
verse keel and in front with nine thin longitudinal keels; 
the outermost kee! consists of a relatively high thin plate 
extending about to the middle of the disc; the next inner 
keel is similar but diminishes in height and extends as a 
wavy keel to about one third the distance to the apex; 
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