obtusa. Labellum in positu naturali arcuato-decurvatum, 
extensum oblongo-oblanceolatum, supra medium con- 
strictum; pars inferior suleata, basi concavo-saccata et 
cum callo mammillato submarginali utrinque praedita, 
extus puberula; pars anterior plana et patens, late ovata 
vel elliptico-subquadrata, apice late rotundata vel leviter 
retusa; discus callo suleato miniato vel aurantiaco infra 
ornatus. Columna generis. 
Plant terrestrial, 25-85 cm. tall, aphyllous at the time 
of flowering, slender, rigidly erect, arising from a solitary 
tuberoid, stoloniferous, slightly geniculate at the base, 
glabrous below, the upper part covered with a hoary pu- 
berulence; stolons producing at intervals solitary small 
ovoid tuberoids which are as much as 2 em. long. Stem 
provided with appressed green tubular sheaths which are 
rather abruptly subobtuse to acute. Inflorescence 2-flow- 
ered. Flowers white marked with orange or vermilion, 
subtended by large bracts; pedicellate ovaries covered 
with areddish brown glandular puberulence. Floral bracts 
green, lanceolate, acuminate, about 8.5 em. long, with 
involute margins. Sepals densely tuberculose-puberulent 
on the margins and outer surface; dorsal sepal strongly 
recurved above the middle, concave below, elliptic-lan- 
ceolate, obtuse to shortly subacuminate, prominently 5- 
nerved, 1.9—2 cm. long, 4.5-6.5 mm. wide; lateral sepals 
free, divergent, directed downward, lightly carinate along 
the central nerve, lanceolate, subobtuse to acute, slightly 
oblique, prominently 8-nerved, 1.7—2 cm. long, 3.1-3.5 
mm. wide. Petals conspicuously faleate, oblanceolate, 
obtuse, gradually tapering below the middle, 1.8—2 cm. 
long, 8-8.2 mm. wide above the middle. Lip arcuate- 
decurved in natural position, oblong-oblanceolate, con- 
stricted above the middle, 1.8—2.2 em. long ; lower portion 
(below the constriction) thick, suleate, minutely pubes- 
cent and concave-saccate at the base, provided with sub- 
[ 64 | 
