444 CALIFORNIA ACADEMY OF SCIENCES. 



which it propagates iu the succeeding year, is formed deep 

 in the substance of the leaf, and only becomes free by its 

 decay. 



Yineyards in the vicinity of infested wild vines will sooner 

 or later acquire it from them ; and the experience of the 

 coffee plantations of Ceylon will be repeated. These be- 

 came infected by a fungus, probably infrequent on the 

 original host, which propagated itself to such an extent on 

 the more fertile one as almost to ruin the planters. 



The only effectual remedy which can be suggested is to 

 destroy by fire the infected vines — taking especial care that no 

 leaves escape; and where a vineyard is to be planted in the 

 vicinity of wild vines, it would be well to destroy the lat- 

 ter as a measure of precaution. 



Peronospoka Oxybaphi, E. & K. — On living leaves of 

 Abronia Crax-Malke, Reno, Nevada, August, and A. luiibel- 

 lata, San Francisco, November, 1882. 3368, 3436 



Yalsa impulsa, C. & P. — On Pyrus samhucifolia, Donner, 

 August, 1883. 3551 



Yalsa femoralis, Pk. — On dead twigs of Alnus rubra, 

 Sunol, December, 1881. 2961 



Yalsa exigua. Nits. — On dead twigs of Acer macrophyl- 

 lum, Sunol, September, 1882. 3385 



DiATRYPELLA Frostii, (Pk.) — On dead branches oi Acer 

 macrophyllum, Tamalpais, February, 1885. 3907 



DiATRYPELLA PROMINENS, Howe. — On dead branches of 

 Platanus racemosa, Sunol, January, 1885. 4007 



DiATRYPE Rhois (Schw.) — On dead branches of Elms di- 

 versiloba, San Francisco, September, 1885. 4074 



