88 ORCHIDACEM 



late, acute, 1-nerved, 2.5 mm. long, about 1 mm. wide. Upper 

 sepal similar to the laterals, about 3 mm. long. Petals lanceolate, 

 acute, 2 mm. long, 1-nerved. Labellum 1.25 mm. wide, 3-lobed ; 

 lateral lobes oblong-falcate, rounded at the apex, erect, clasping 

 the column ; middle lobe broader than long, the apex retuse, 

 mucronate. From the inner basal margin of each lateral lobe a 

 thickening, callus-like in its nature, extends to the middle of the 

 middle lobe, where the two thickenings become confluent. Col- 

 umn minute, with a protuberance in front. 



D. parmdum, which is the smallest member of the genus known 

 to come from the Philippine Islands, resembles closely D. tenue, 

 though this is a larger species, with longer leaves, more slender, 

 longer pseudobulbs, longer racemes and narrower, 3-nerved sepals. 

 The leaves of D. parmdum do not taper at the base so abruptly 

 as those of D. tenue. No. 3217 of Merrill's collections consists of 

 a mixture of D. parmdum and D. tenue. 



Lamao River, Mt. Mariveles, Prov. Bataan, Luzon, October, 

 1903, E. D. Merrill (no. 32176). — Lamao River, Mt. Mariveles, 

 May, 1904, H. N. Whitford (no. 141). 



Endemic. 



10. D. VENUSTULUM Ames supra, p. 12, t. 22. — Acori- 

 dium venustulum Ames Proc. Biol. Soc. Wash. 19 : 147 (1906). 



Pseudobulbs fusiform, 2 cm. long, monophyllous. Leaves linear- 

 oblanceolate, 6-7.5 cm. long, 5-8 mm. wide, rounded at the tip, 

 acute. Petiole 5-10 mm. long, slender. Peduncle below inflores- 

 cence 5-7 cm. long, very slender, flexuose, with several imbricat- 

 ing bracts below the inflorescence. Inflorescence 5-7 cm. long, 

 about 5 mm. through, densely many-flowered. Pedicels about 2 

 mm. apart. Bracts much longer than the ovary, ovate from a 

 broad base, glumaceous, obtuse, 2.5 mm. long. Flowers small, 

 dull yellow, in two rows, forming a graceful drooping raceme. 

 Lateral sepals broadly ovate, acute, 1-nerved, 3 mm. long, 1.5 

 mm. broad. Upper sepal lanceolate, acute, considerably narrower 



