ORCHIDACE^E 83 



5 mm. through. Bracts glumaceous, longer than the ovary, 2 mm. 

 long. Flowers 2-3 mm. apart, distichous, greenish white, forming 

 a graceful pendulous raceme. Lateral sepals ovate-lanceolate, 

 acute, 3-nerved, 3 mm. long, 1.5 mm. wide. Upper sepal nar- 

 rower, oblong, 3 mm. long, 1 mm. wide. Petals rhombic-oblance- 

 olate, acute, 3-nerved, about 3 mm. long, 1 mm. wide. Ldbellum 

 3-lobed or trifld ; lateral divisions largest, oblong-falcate, obtuse, 

 with a minute callus at the base of each near the sinus formed 

 with the oblong, obtuse middle lobe, which is 1 mm. long. Col- 

 umn much like that of D. tenellum. 



An interesting addition to the grass-leaved division of the sec- 

 tion Acoridium. From D. tenellum and D. sphacelation it is at 

 once distinguished by its stricter habit, thicker, triangular leaves, 

 larger flowers, and very different lip. The flowers at the summit 

 of the raceme begin to expand first, a character which does not 

 hold in D. tenellum, D. sphacelatum, or D. graminifolium, in all 

 of which species the lowermost flowers are the first to bloom. 



Growing on rock, Trinidad, Pro v. Benguet, northern Luzon, Sep- 

 tember 28, 1904, M. S. Williams (no. 1939, in hb.N. Y.Bot. Gard.). 



Endemic. 



5. D. GRAMINIFOLIUM Ames supra, p. 12, t. 22. — Acori- 

 dium graminifolium Ames Proc. Biol. Soc. Wash. 19 : 144 (1906). 



Affinity with D. tenellum. A tufted grass-like epiphyte, with 

 yellow fragrant flowers which turn deep reddish brown when dry. 

 Pseudobulbs stem-like, fusiform, 7-8 cm. long, strongly grooved 

 when old, clothed with elongated, tubular, maculate, acute, closely 

 appressed sheaths, the fibrous remains of which persist. Leaves 

 grass-like, linear, prominently nerved, with a conspicuous mid-rib, 

 at the base contracted into an elongated petiole, above flat, 30 cm. 

 long, 2.5-3 mm. wide, acute. Peduncles below inflorescence fila- 

 mentous, shorter than the leaves, from near the summit of which 

 they appear to arise, and to the face of which they adhere lightly 

 for a part of their length. Inflorescence 4.5-5 cm. long, 8-10 



