ORCHIDACEM 87 



Lateral sepals linear-lanceolate, acuminate, acute, 3-nerved, 3 

 mm. long, 0.9-1 mm. wide. Upper sepal similar to the laterals. 

 Petals narrowly lanceolate, acuminate, acute, 2.5 mm. long. 

 Labellum 3-lobed; lateral lobes diaphanous, semi-crescentiform, 

 subacute, with a free callus-like appendage at base on the inner 

 margin of each ; middle lobe 0.5 mm. long, tridentate, the lat- 

 eral teeth rounded, obtuse or subacute ; near the base of the lip 

 on the median line is a minute tubercle or callus. Column minute, 

 similar to that of D. tenellum. 



D. tenue in habit forms a connecting link between the grass- 

 leaved I). graminifoliicm and the broad-leaved D. venustulum. 

 The lip, however, is more like the lip of D. tenellum. From Dr. 

 Schlechter's description (Bull. Herb. Bois. ser. 2, 6 : 302, 1906) 

 of Platyclinis microchila, said to have come from the Philip- 

 pines, this species — which under my view of the genus becomes 

 Dendrochilum microchilum (Schlechter) Ames — and D. tenue 

 appear to be very closely allied. 



Growing on mossy trees, trail to Mt. Apo, Mindanao, April 19, 

 1904, E.B. Copeland (no. 1019 a) ; additional material from Lamao 

 River, Mt. Mariveles, Prov. Bataan, Luzon, October, 1903, E. D. 

 Merrill (no. 3217 a). — Mt. Malindang, Prov. Misamis, Mindanao, 

 May, 1906, Major Mearns & W. I. Hutchinson (no. 4605 A). 



Endemic. 



9. D. PARVULUM Ames supra, p. 12, t. 21. — Acoridium 

 parmlum Ames Proc. Biol. Soc. Wash. 19: 146 (1906). 



Affinities with D. tenue. Whole plant not exceeding 8 cm. in 

 height. Pseudobulbs monophyllous, 4-10 mm. long, clothed with 

 acute tubular sheaths. Leaves linear-oblong, obtuse, truncate, 

 prominently 3-nerved, 2-3.5 cm. long, 2-2.5 mm. wide. Peduncles 

 below the inflorescence very slender, slightly longer than the 

 leaves, 3—4 cm. long. Raceme graceful, 1.5-2 cm. long, about 3 

 mm. through. Bracts acute, longer than the ovary, 1.5 mm. long. 

 Flowers when spread out 4 mm. across. Lateral sepals lanceo- 



