486 The Philippine Journal of Science 1932 
racemis laxis dispositi. Sepala lateralia lineari-lanceolata, sub- 
acuta, circiter 5 mm longa, 1.25 mm lata, 3-nervia, levissime 
falcata. Sepalum dorsale lineari-lanceolatum, acutum, circiter 
5 mm longum, 1.5 mm latum, 3-nervium. Petala lineari-oblan- 
ceolata, obtusa vel acuta, circiter 4 mm longa, 1 mm lata, 
1-nervia. Labellum obovato-oblongum, medio utrinque leviter 
angustatum, ad apicem late rotundatum vel retusum, circiter 2 
mm longum, 1 mm latum, 3-nervium, ad basim bicallosum; pars 
inferior abrupte reflexa. Columna brevis, ad apicem trilobatam 
dente medio bidentato, dentibus lateralibus erectis, triangulari- 
linearibus. Pollinia quatuor. 
Rhizomes creeping, elongated, slender, 2 to 2.5 mm in diam¬ 
eter, copiously rooting at the nodes. Roots fibrous, branching. 
Pseudobulbs narrowly cylindric, 2 to 3 cm long, rugose when dry, 
2 to 5.5 cm apart. Leaves shortly petioled, coriaceous, oblong- 
lanceolate or very narrowly elliptic, 7 to 8.5 cm long, 1 to 2 cm 
wide, tapering at both ends, the apex acute; petioles 2 to 4 mm 
long. Scapes commonly longer than the leaves, 8 to 11 cm long, 
slender, flexuose or pendant, arising from the base of the pseudo¬ 
bulbs, sheathed at base with several tubular bracts. Bracts sub¬ 
tending the flowers lanceolate, acute, concave, up to 2 mm long. 
Flowers marguerite yellow, laxly disposed on the racemes. La¬ 
teral sepals linear-lanceolate, subacute, about 5 mm long, 1.25 
mm wide, 3-nerved, slightly falcate. Dorsal sepal linear-lan¬ 
ceolate, acute, about 5 mm long, 1.5 mm wide, 3-nerved. Petals 
linear-oblanceolate, obtuse or acute, about 4 mm long, 1 mm wide, 
1-nerved. Labellum glabrous, obovate-oblong, in the middle on 
each side slightly narrowed, reflexed at the base, about 2 mm 
long, 1 mm wide, broadly rounded or retuse at the apex, the 
base subhastate and bicallose, 3-nerved. Column very short, 
arcuate, at the apex trilobed, the middle tooth bidentate, the 
lateral arms triangular-linear and suberect. Pollinia 4. 
Luzon, Manila, Bureau of Science orchid house, Bur. Sci. 
81t5Jf6 Quisumbing, May 19, 1931. The living plants were col¬ 
lected by Messrs. M. Ramos and P. Convocar from near the banks 
of Camahalan River, Agusan Province, Mindanao, growing on 
rocks, April 30, 1931. Living specimens are now growing on the 
tuff (Guadalupe stone) walls in the Bureau of Science orchid 
house in Manila. 
This is the third collection of this species. In general habit 
it very closely resembles D. aurantiacum Blume, but differs in 
the details of the flowers. 
