ORCHIDACE 
many species of Dendrochilum are characterized by a remark- 
able tendency toward montane endemism. Of course it is quite 
probable that the apparent isolation of Dendrochilum irigense 
Ames on Mount Iriga, of D. ocellatum Pfitz. on Mount Data and 
of D.sphacelatum Pfitz. on Mount Santo Tomas, to mention only 
a few of many examples, may be the result of incomplete know- 
ledge of their actual distribution. If it were not for the repeated 
discovery of some of these species in their original stations, and 
for their absence from collections made elsewhere, the suggestion 
that deductions as to restricted distribution are premature at this 
time might be seriously entertained. At least until there is evi- 
dence to the contrary, it will be well to act on the hypothesis that 
the alpine species of Dendrochilum are often endemic on isolated 
mountains. 
Although the evidence obtained from an examination of re- 
cent collections indicates that we have made substantial progress 
toward a comprehensive survey of the Philippine orchid flora, it 
is highly probable that unexplored and lightly touched regions, 
especially the mountainous regions of Mindanao and Mindoro, 
will bring to light many new species. It is very desirable that 
Mount Halcon should be ascended again for botanical purposes. 
Some of the species obtained on this mountain by Merrill in 1906 
have not since appeared in collections from other sources, and 
many of them are represented in herbaria by very scanty mate- 
rial. Mount Data would seem to have an exceptionally interest- 
ing orchid flora, and an effort to assemble it would be distinctly 
worth while. Some of the species described from specimens col- 
lected on Mount Data should again be sought for. I have in 
mind especially Dendrochilum olganthum Pfitz.and D.ocellatum 
Pfitz., two very remarkable species that are poorly represented 
by the material obtained in 1905 by Merrill. Even though the 
