1919-20 DEPARTMENT OF LANDS, FORESTS AND MINES. 125 



Fomes roseus (A. & S.) Cooke. Fairly common on dead wood. 



Phaeolus sistotremoides. This, together with the following are the commonest 



cause of heart rot in this pine. 

 Porodaedalea pini. 



Tyromyces anceps (Peck) Murr. On dead wood. 

 Coleosporium solidaginis (Schw.) Thum. Abundant on asters as an alternate 



host. It is to be looked for on the needles of both the red and jack pine. 



White Pine (Pinus strobus L.) 



Cronartium ribicola Fischer. This destructive stem rust of white pine is widely 



distributed throughout southern Ontario on white pine and on various 



Ribes. It has not yet been found in Northern Ontario. 

 Lophodermium pinastri (Schr.) Chev. A cause of leaf fall, but apparently 



not serious. 

 Polyporus osseus Kalch. Infrequent, possibly the cause of a not hitherto 



reported heart rot. 

 Phaeolus sistotremoides. Very common, doing extensive damage to mature 



or nearly mature timber. 

 Porodaedalea pini. A serious heart rot, common in some localities. The 



white-spotted lumber made from diseased trunks is utilizable to a certain 



extent such as is not the case with the last. 

 Tyromyces anceps (Pk.) Murr. On fallen trunks. 



White Cedar or Arbor Vitae (Thuja occidentalis L.) 



Armillaria mellea (Vahl.) Quel. Apparently a common root-rot of cedars 

 of all ages. Is also reported here for the first time as a cause of heart rot. 



Coriolus balsameus (Pk.) Murr. Found by Mr. A, W. McCallum for the 

 first time as a probable cause of a heart rot of cedar in the Timagami 

 Forest Reserve. 



Keithia thujina Durand. An extremely interesting leaf disease of cedar. 

 This fungus has recently been reported as the cause of a highly destructive 

 leaf blight of young western cedars on the Pacific coast. Little else 

 except the original record of its occurrence in Wisconsin is known, so 

 that the finding of it in the Timagami Forest Reserve is of special 

 interest. 



Pestalozzia spec. The cause of a leaf disease. 



Phaeolus sistotremoides (A. & S.) Murr. Probably the cause of the com- 

 monest of the heart rots of the cedar in Northern Ontario. 



Porodaedalea pini (Thore) ^lurr. Reported for. the first time as the cause 

 of a heart rot in arbor vitae. 



I have the honour to be sir, 



Your obedient servant, 



E. J. Zavitz, 



Provincial Forester. 



