ORCHIDACEiE 



Hook, f., Z>. longispicatum Ames, D. Clemensice Ames, and D. la- 

 tifoliuni Lindl. may be cited. All of these species, however, dif- 

 fer from each other in their vegetative development and in the 

 position of the stelidia on the gynostemium. The whole section is 

 readily separated into three groups distinguished by having an 

 entire, or obscurely 3-lobed, or conspicuously 3-lobed, labellum. 



Dendrochilum pumilum Reichb. f. This species was originally 

 described by H. G. Reichenbach f in Bonplandia on page 222 

 of the third volume (1855). The description was drawn from 

 material gathered by H. Cuming in the Philippine Islands and 

 distributed as herbarium specimens under the number 2102. In 

 1861 Reichenbach, in accordance wdth other sweeping changes, 

 referred D. pumiluvi to the genus Coelogyne in Walpers's An- 

 nales Botanices Systematicce (6: 236). 



Until very recently nothing had been done to clear away the 

 seemingly unavoidable obscurity under which this species has 

 remained. In his review of the genus Dendrochilum, J. J. Smith 

 doubtfully referred D. pumiluvi to the section Eudendrochi- 

 lum.* In the Pfitzer-KranzUn treatment of the Ccelogyninee it is 

 placed among the dubious species as insufficiently known. In 

 my studies of the orchid flora of the Philippine Islands for the 

 second fascicle of this work, I searched for specimens represen- 

 tative of Cuming's no. 2102, and discovered one in the herba- 

 rium of the British Museum. I have compared this specimen 

 carefully with the description published by Reichenbach, and 

 with specimens from the Philippines which I had provisionally 

 determined to be D. pumilum. Reichenbach's description in 

 Bonplandia is not all that one might desire to elucidate an am- 



* In "Walpers's Annales Botanices Systematicce 6: 927 Reichenbach refers this species to 

 § Eudendrochilum. It is presumable, however, that he did so through a misinterpretation 

 of Cuming's material. 



[6] 



