1919-20 DEPAETMENT OF LANDS, FORESTS AND MINES. 123 



Balsam (Abies balsamea (L.) Mill.) 



Armillaria mellea (Vahl.) Quel. Not infrequent on the roots and also found 

 causing heart rot of trunk — the latter an apparently unreported occur- 

 rence. 



Bjerkandera adusta (Willd.) Karst. A form common on hardwoods, but rare 

 on conifers. 



Calyptospora columnaris (A. & S.) Kiihn. This needle rust is common on 

 balsam, and on its alternate hosts, the blueberries (Vaccinium), in the 

 Timagami Forest Eeserve, though not especially injurious. It appears 

 to have been reported on balsam not more than once or twice previously 

 from America. 



Coriolus hdlsameus (Pk.) Murr. Not uncommon on dead wood. For the 

 first time reported as the cause of a heart-rot. 



Frost injuries. A great many small dead branches on living balsams are 

 common throughout the Timagami Forest Eeserve. An examination of 

 the bases of these branches discloses a wound apparently caused by the 

 gnawing of some insect, at the end of the growing season. Frost pre- 

 sumably completes the destruction. 



Fuscoporia marginella (Peck) Murr. Eare on fallen trunks. 



Hyphoderma. An interesting form, apparently the cause of a needle disease. 



Lophodermium nervisequum, Fries. Frequent on the living needles and some- 

 times causing complete defoliation. 



Macrophoma. Common on the needles but whether or not the cause of their 

 death remains undecided. 



Melampsorella elatina (A. & S.) Murr. This rust which is the cause of the 

 witches' brooms on balsam is not rare. 



Phaeolus sistotremoides (A. & S.) Murr. (Polyporus Schweinitzii Fries). 

 The cause of by far the worst disease of balsam and of most other conifers 

 of the Timagami Forest Eeserve. Some stands are fully "^5 per cent, 

 buttrotted by this fungus. 



Porodaedalm pini (Thore) Murr. (Trametes Pini Fries). A common and 

 important cause of heart rot of many conifers; in Ontario it is occasion- 

 ally the cause of heart rot of balsam. 



Pucciniastrum pustulatum (Pers.) Diet. Common, and found both on the 

 needles of the balsam and the leaves of its alternate host, the fireweed 

 ( Epilobium angustif olium ) . 



SpongipelUs horealis (Fries) Pat. (Polyporus borealis Fries). Cause of a 

 heart rot, apparently not frequent. 



Uredinopsis mirabilis (Peck) Magn. Common on the leaves of the balsam 

 and its alternate host, the ferns (especially the beech fern, Phegopteris 

 dryopteris). 



Valsa Friesii (Duby) Fckl. Apparently the cause of cankered branches. 



I 



White Spruce (Picea canadensis (Mill.) BSP.) 



Phaeolus sistotremoides (A. & S.) Murr. White spruce is fairly free from 

 fungus diseases in the Timagami Forest Reserve. This and the one follow- 

 ing are the two commonest causes of heart rot. 



Porodaedalea pini (Thore) Murr. 



Tyromyces guttulatus (Pk.) Murr. Infrequent on dead wood. 



