ORCHIDACE^ 



of the nearby Philippines, thirty-six species being natives of the 

 higher altitudes of Luzon. 



The group formed by D. Gibbfdae, D. Haslamii, D. kinahalu- 

 ense, D. exasperatuvi., and D. quinquelobum lacks Philippine rep- 

 resentatives. The same is true of the group to which D. alatum, 

 D. Jimbiiatum^ and D. Joclemensii belong. D. grandiflorum, at 

 present known only from Mount Kinabalu, has no near relatives. 

 D. imbricatum and D. Deivindtianum, on the other hand, are 

 closely allied with the Philippine species that constitute Pfitzer's 

 series Dilatata, but the representatives of this group are few in 

 number on Mount Kinabalu, and belong to that section of Den- 

 drochilum which is characterized by wide distribution in the 

 Malayan tropics. 



With the additions herein noted Dendrochilum with forty-five 

 species becomes one of the largest of Bornean orchid genera. 

 Surely we may expect a rich harvest of interesting acquisitions 

 as intensive collecting brings to our attention the numerous spe- 

 cies that must still await discovery. It would seem that Borneo 

 will rival the Philippines as a home of Dendrochilum species 

 and furnish material that will help to crystalize our knowledge 

 of one of the most fascinating orchid genera of the eastern 

 tropics. 



I. Dendrochilum alatum Ames sp. nov. Radices fibratae, 

 glabrae. Pseudobulbi monophylli, obpyriformes, rugosi, superne 

 attenuati. Folium lineari-lanceolatum, prominenter trinervium, 

 obtusum, apiculatum, in sicco subchartaceum, quam peduncu- 

 lus brevius. Pedunculus gracilis, flexuosus. Racemus multiflorus. 

 Sepala petalaque similia. Labellum simplex, obcuneatum, bical- 

 losum. Gynostemium erectum, stelidia lateralia in alas ellipticas 

 producta. Ala terminahs tridentata. 



Plant from base of pseudobulb to tip of leaf up to 20 cm. 



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