223 
tional, but in N, Perak the fungus often progresses in the wood 
1 to 2 inches below the veut. The penetration of the wood is as 
rapid in the vertical as in the radial direction, but there is little 
lateral growth. As a result the Black Stripes remain localised; 
the fungus appears largely confined to the medullary rays in its 
passage through the woo 
These observations, coupled with the fact that a species of 
Phytophthora was isolated from diseased wood taken at a depth 
f } of an inch in the stem, are significant. Numerous isola- 
tions were made which all turned out pure cultures of the same 
species of Phytophthora. The isolation of P. Faberi from 
decaying bark en the renewing surface has presented some diffi- 
culty to previous observers and when attempting to prove the 
incidence of the disease they have utilised pure cultures obtained 
from diseased seed pods for inoculating experiments. Time 
would not permit a comparative study of the fungus to determine 
whether it agreed with the description of P. Faberi but it may 
be stated with some degree of certainty that a Phytophthora is 
responsible for the symptoms observed in N. Perak. 
Bark Canker symptoms in Negri Sembilan. 
The Negri Sembilan outbreak, though an infection of renew- 
ing bark, shows different symptoms to that in Northern Perak 
and if a determination of the disease depended on a comparison 
of external signs there would be justification for stating that 
two different bark diseases occur in Malaya. In this case there 
is practically no penetration of the wood; the active radial and 
vertical growth in the wood so characteristic of the N. Perak 
fungus is missing. Apart from the absence of Black Stripes 
the outbreak corresponds to Bark canker as described from 
Java and Sumatra. Pratt (5) in Sumatra describes bad ° 
cases in which ‘‘individual black lines are not apparent, 
1 1 ing black.”’ He makes 
running roughly parellel to the tapping cut. _greyish-white 
is caused by a growth of saprophytic fungi, a species of 
Cephalosporium predominating. Dastur (3 s that in 
Malaya on leave showed no indications of the presence of a 
Phytophthora. 
