PINE BLISTER-BLIGHT 235 



PINE BLISTER-BLIGHT 



{Cronartiiun asclepiadej/m, Fr. 

 ■= Peridermium cornui, Rostr. and Kleb. ) 



The aecidia occur on the bark of Scots fir {Pmus silves- 

 tris), and produce effects very similar to those described 

 under Peridermhcm pint. 



The hairlike bundles of teleutospores and uredospores 

 grow on the under surface of the leaves of Cyiianchmn 

 vincetoxiaini. 



Supposed varieties of this species occur on oaks 

 {Quercus nigra and Q. ttnctoria), also on CoiJiandra unibel- 

 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 



lyMelampsora pinitorgiia, Rostrup. 

 ■= Caeoma pitiitorqiitwi, 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 



