PINE BLISTER-BLIGHT 235 



PINE BLISTEK-BLIGHT 



(Cronartium asclepiadeum, Fr. 

 Peridermium cornui, Rostr. and Kleb.) 



The aecidia occur on the bark of Scots fir (Pinus silves- 

 tris\ and produce effects very similar to those described 

 under Peridermium pint. 



The hairlike bundles of teleutospores and uredospores 

 grow on the under surface of the leaves of Cynanchum 

 vincetoxicum, 



Supposed varieties of this species occur on oaks 

 (Quereus ntgra and Q. tinctoria), also on Comandra umbel- 

 lata and C. pallida in the United States, also on leaves of 

 Asclepia speciosa in France. 



Prillieux, Malad. des Plantes Agric.) vol. i. p. 271, figs. 



Cronartiumflaccidum, Winter. Uredospores and teleuto- 

 spores on the under surface of leaves of cultivated paeonies. 

 Aecidial condition unknown. Other species are also known, 

 in which the aecidia are not yet known. 



PINE BRANCH TWIST 



(Melampsora pinitorqua, Rostrup. 

 = Caeoma pinitorquum^ A. Br.) 



The aecidium condition of the present fungus has been 

 proved by Hartig to be very destructive to young pines, 

 seedlings being sometimes diseased when just appearing 

 above ground, whereas at the age of about thirteen years 

 the disease dies out, and plants that have not been too 



