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MERRILL. 
others previously known only from Borneo. Bornean types, considering 
the proximity of the Philippines to that large island, are rather rare in 
the Archipelago. Whitehead 1 s plants have been considered by Bendle. 2 
Most of the species collected by Whitehead on Halcon were also brought 
in by me on the expedition under discussion. Hugh Cuming collected 
in Mindoro, between the years 1836 and 1840. He undoubtedly worked 
in the vicinity of Calapan and on the Baco River, at the north base of 
Halcon, although he probably did not penetrate far into the interior 
of the island. Cuming , in most cases, did not give localities for his 
plants; he was never more definite than to give the province or island, 
so that we are not absolutely certain as to just what parts of Mindoro 
he visited. In 1903 and 1905 I made short collecting trips up the Baco 
River, and in 1905 Mr. R. C. McGregor, of this Bureau, collected a con- 
siderable number of plants in the same region. In June, 1906, Mr. 
M. L. Merritt, of the Philippine Forestry Bureau, accompanied Lieut. 
T. II. J ennings on his attempt to ascend Halcon. The party reached an 
altitude of 7,250 feet and brought in 165 numbers of plants representing 
about 150 species. The plants collected by myself in November, 1906, 
are represented by 74-2 numbers and comprise about 600 distinct species. 
The greater part of this material was gathered within a period of thirty 
days, from November 2 to December 2, 1906, under very unfavorable con- 
ditions. The weather, nearly every day, was more or less rainy, and for 
thirteen days in succession, while the party was at and above an altitude 
of 4,500 feet, the rain did not cease day or night. As a result of these 
conditions much of the collecting was accomplished in the wet, and all 
specimens were of necessity dried by means of fire. Material once dried 
could only with difficulty be preserved, and constant alertness was needed 
to protect our collections against moisture when we were in camp, while 
packing and moving in the pouring rain, and as we were fording streams. 
The material secured by Mr. Merritt was prepared under scarcely more 
favorable circumstances. 
The present paper is based on the plants collected by Mr. Merritt 
and on those secured by myself, 271 species and varieties being consid- 
ered; these are distributed into 83. families and 168 genera. Two genera 
are proposed as new and two families are added to the number previously 
known from the Philippines, one of these, Centrolepidacece being quite 
new to the Archipelago, and one, Iridacece, was previously known to be 
represented in the Philippines only by introduced and cultivated species. 
Seven genera and fifteen species are reported from the Philippines for 
^ f „ time, while thirty-nine species are described as new. The above 
summary is based only on the material considered in the present paper. 
The vascular cryptogams collected on Halcon by me have already been 
2 Journ. Hot. (1896), 34, 355-358. 
