XIV, 1 Reinking: Coconut Bud Rot in the Philippines 143 
abundance by young cultures on oat meal agar, and conidia 
are only sparingly formed. In older cultures more conidia are 
produced. On corn meal the reverse was true in the prelimi- 
nary tests. These tests also indicated that on potato agar and 
on macerated corn the chlamydospores appeared before the 
conidia. 
MYCELIUM 
The mycelium is white, producing a dense mass in pure cul- 
ture. In young cultures it is nonseptate and granular. In 
older ones septa may be produced. Protoplasmic streaming 
is common. The submerged mycelium is more or less gnarled, 
while the aerial is straight. Branching is abundant. The width 
varies from about 3 to about 8 microns. 
CONIDIOPHORES 
Conodiophores are produced in great abundance in pure cul- 
ture, especially on corn meal. Special culture methods must be 
employed in order to show them in their best condition. Mate- 
rial showing excellent conidiophore production may be obtained 
in sterilized Van Tieghem c§lls, by placing a few spores on a film 
of agar that has been put on the flamed cover slip. Each coni- 
diophore may bear from one to fifteen or more conidia. A coni- 
dium is produced at the tip of a conidiophore; the latter then 
continues its growth by pushing the conidium to one side, and 
produces another conidium at its tip. By a continuation of this 
process a bunch of spores is finally formed. The conidiophores 
vary in size, ranging approximately from 180 to 645 microns 
in length and from 3 to 6 microns in width. 
CONIDIA 
The conidia are produced terminally as described above. They 
are elliptic to ovate, and possess^ very prominent raised terminal 
papillse. These spores are pale yellow to colorless, and densely 
granular, usually having a large vacuole. Older conidia possess 
more granules that are in groups. 
Measurements of conidia. — The measurements conform with 
those of Phytophthora faberi Maubl. as determined by Rosen- 
baum. (lO) Measurements were made from two-day-old cultures 
on corn meal. The lengths and widths of two hundred spores 
were measured. The results are presented in Table V, which 
gives the class in microns and the number of conidia out of two 
hundred, both for length and width, that falls into each class. 
162323 10 
