86 ORCHIDACEM 



prominent mid-rib, 3-12 cm. long, 2-4 mm. wide, contracted 

 below into a slender petiole 1.5 cm. long. Peduncle below inflo- 

 rescence exceeded by the leaf, flexuose, 3.5-5.5 cm. long to the 

 lowermost bract of the inflorescence. Bracts 2 mm. long, longer 

 than the ovary. Flowers white, less than 2 mm. apart. Lateral 

 sepals triangular-lanceolate, 1-nerved, acute, 3 mm. long, 1 mm. 

 wide. Upper sepal 3 mm. long, similar to the laterals. Petals 

 lanceolate, 1-nerved, 2 mm. long. Labellwn minute, 3-lobed with 

 relatively long lateral lobes which are erect, oblong, obtuse, and 

 diverted forward at right angles to the column ; the saccate mid- 

 dle lobe, which is fleshy and provided with a pitcher-like tip at 

 the apex, passes at its basal margin, or rim, into thickenings, or 

 calli, one on each side at the sinus formed by the lateral and middle 

 lobes ; lateral lobes from sinus to apex, 1 mm. long, 1-nerved. 



While D. tenuifolium is closely allied to D. tenue and D.parvu- 

 lum, it is very distinct from both, and well characterized by its ob- 

 long, 1-nerved lateral lip-lobes and by its acute, attenuated leaves. 



Epiphyte, in rain forest, Mt. Data, Distr. Lepanto, Luzon, alt. 

 7000 ft., October 29, 1905, E. D. Merrill (no. 4576).— Mt. Santo 

 Tomas, Prov. Benguet, August 8, 1906, H. M. Curran (no. 4980.) 



Endemic. 



8. D. TENUE Ames supra, p. 12, t. 21. — Acoridium tenue 

 Ames Proc. Biol. Soc. Wash. 19: 145 (1906). 



Whole plant when in flower 12-18 cm. high, slender through- 

 out. Pseudobulbs 1.5-2.2 cm. long, fusiform, when immature 

 concealed by the tubular, nervose, acute sheaths. Leaves linear- 

 oblong, obtuse, with a minute indentation on the margin on each 

 side above the middle, prominently 3-nerved, 3-6 cm. long, 2-4:.5 

 mm. wide. Petioles slender, 1 cm. long. Peduncle below inflo- 

 rescence filiform, shorter than the leaf and petiole or sometimes 

 slightly longer, 4.5-8 cm. long. Bracts longer than the ovaries, 

 erose-dentate on the margin, 2 mm. long. Floicers 2 mm. apart, 

 in slender, graceful, flexuose racemes. Racemes 2.7—6.3 cm. long. 



