PINE CONE FUNGUS 263 



Chrysomyxa ahietis^ Unger. — The teleutospore condition 

 is alone known, forming pale yellow spots on spruce leaves. 

 The formation of teleutospore pustules commences during 

 the year of infection, reaches a certain stage of develop- 

 ment, and passes into a resting condition until the following 

 season, when the development is completed, the teleuto- 

 spores germinating in situ during the month of May, 

 when the secondary spores produced are conveyed to 

 young larch leaves, which become infected. Hartig states 

 that as a rule little injury is caused by the parasite. 



PINE CONE FUNGUS 



{Aecidiicm strobili?ium, Reess.) 



The aecidia are formed on the inner surface of the 

 carpellary scales or bracts of cones of the Norway spruce 

 i^Abies excelsa) ; a few aecidia also sometimes develop on 

 the outer surface of the scales. The mycelium of the 

 fungus destroys the inflorescence. The aecidia are sub- 

 globose, or often angular from lateral pressure when 

 crowded, brown, and opening by an irregular crack. 



Hartig states that the diseased fallen cones can be 

 readily distinguished by opening even in damp weather, 

 under which condition sound cones remain closed. 



Reess, Die Rostpilzformen der Deiitschen Coniferen, p. 100. 



Aecidiw7i pseudo - columnare^ Kiihn. — The elongated 

 aecidia grow in two rows on the under surface of the 

 leaves of Abies pectinata and other species of Abies. 



Aecidium 7?iageihae?iicur?i, Berk. — Grows on species of 

 Berberis. The perennial mycelium distorts the buds of 

 the host, and causes the formation of ' witches' brooms.' 



