658 Philippine Journal of Science 1919 
other plants, it has seemed desirable to present certain data 
regarding the occurrence, appearance, and means of control of 
Corticium. Photographs of the various stages on Citrus are 
also presented, so that this disease may be recognized and the 
necessary measures applied for its control or eradication before 
it becomes widely distributed over the Philippine Islands. The 
name pink disease is commonly accepted by rubber planters 
throughout British Malaya and elsewhere as denoting the disease 
caused by Corticium salmonicolor B. & Br. This term is de- 
scriptive of the commonest form taken by the fungus and, as 
its use seems acceptable, it is continued here. Although Corti- 
cium has been thoroughly studied by us, no pretension is made 
that this paper contributes anything to the excellent studies on 
the morphology of the fungus already published by Rant, Brooks 
and Sharples, and others. 
aS HISTORY 
Corticium salmonicolor B. & Br. apparently first attracted 
attention about 1897 when it appeared as a disease of coffee in 
Malaya. Specimens sent to Kew were described by Massee * as 
a new species and genus of Fungi imperfecti which he named 
Necator decretus Massee. In 1901 Zimmermann,‘ working on 
the disease on coffee in Java, described the organism as Corticium 
javanicum Zimm. In 1904 Ridley * mentioned a specimen of a 
fungus occurring upon Hevea that had been sent from Sandakan, 
apparently to be referred to this species, and in 1905° he re- 
ported the disease on two estates in the Malay Peninsula. Ma- 
terial sent to Kew was determined by Massee, this time as 
Corticiwm calceum Fr., a harmless and widely distributed species 
of Europe and America. In 1906 it was also found by Petch’ 
to attack Hevea in Ceylon and southern India, and was recorded 
as Corticium javanicum Zimm. In 1909 Gallagher *® reported 
Corticium zimmermanni Sacc. & Syd., which is a synonym of 
Corticium salmonicolor B. & Br., to be associated with a disease 
of rubber trees in Malaya. Petch® showed that material of 
this fungus was collected by Thwaites in Ceylon and was named 
*Kew Bull. (1898) 119. 
“Centralbl. f. Bakt. Abth. 2, 7 (1901) 146. 
* Agr. Bull. Straits & Fed. Malay States 3 (1904) 174. 
“Agr. Bull. Straits & Fed. Malay States 4 (1905) 423. 
"Report of Gov. Mycologist Ceylon (1906). 
*Bull. Dept. Agr. F. M. S. 6 (1909). ) 
*Petch, T., Physiology and Diseases of Hevea brasiliensis.. London 
(1911) 209. : 
