ORCHIDACE^ 



the three terminal lobes 1 mm. long, .5 mm. wide, oblong-fal- 

 cate, obtuse, retrorse, ascending; middle lobe or cusp 1 mm. 

 long, narrowly triangular, tooth-like, acute, deflexed-ascending. 

 On the disc below the middle is a prominent U-shaped callus, 

 connected by a transverse thickening just below the opening. 

 Gynostemium slender, 1.5 mm. long. Stelidia basal, oblong-lin- 

 ear, hamate, obtuse, equaling the terminal, rounded, concave 

 wing. 



A near relative of D. Gibhsiae Rolfe and D. kinabaluense 

 Rolfe, from which species it differs in the lobing of the label- 

 lum, the lateral lobes being strongly curved backward. Mr. Rolfe 

 compared D. Gibhsiae to D. recurvum Ames, a native of the 

 Philippine Islands, but that species is a member of Acoridium, 

 a section of Dendrochilum, and is comparable rather in the 

 structure of the labellum than through actual affinity to either 

 D. Gibhsiae or D. kinabaluense. Intensive studies of more 

 material than I have been able to examine may reveal closer 

 relationships between D. quinquelohum and the species de- 

 scribed by Rolfe than now seem likely. From careful drawings 

 of D. Gibhsiae and Z). kinabaluense preserved in my herbarium, 

 their affinity is extremely close. They are clearly referable to the 

 Platyclinis section. (Plate 82.) 



KiAU, Clemens 361 (Type), November 1915; Clemens 178,, November 

 1915; Clemens 1^6", November 1915. 3000 feet altitude. Lobong, Clemens 

 289, November 1915. 



21. Dendrochilum simplex J. J. Sm. in Bull. Dept. Agr. 

 Neerl. Ind. 22 (1909) 13. 



To this species I refer a specimen gathered by Clemens on 

 Marei Parei Spur. D. simplex is closely related to D. vaginatum 

 J. J. Sm. and to D. acuminatum J. J. Sm. In the very simple lip 

 it recalls D. au?'antiacum Bl. The elongated rhizome is a con- 



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