96 Forestry Quarterly. 



in groups some distance apart. In April the nearly ripe sclerotia 

 of a definite kind were spread under the little trees, so that the 

 developing ascospores could infect them. From these experi- 

 ments in the open he concludes : 



1. That the fungus on A. Platanoides readily infects A. cam- 

 pestre, but only weakly attacks A. pseud plat anus and A. sac- 

 charum. 



2. That one form on A. pseudoplatanus infects only this host 

 — hence the name Rh. pseudoplatani is proposed. 



3. That the fungus from A. cainpestre infects A. platanoides 

 weakly and A. pseudoplatanus not at all — hence named Rh. 

 a^erinum forma sp. campestris. 



In the second series of tests under glass in the greenhouse, 

 made by spraying or crushing the ripe sclerotia on the leaves, 

 the results bore out the above statements and, in addition, 

 showed two biological species on Acer pseudoplatanus, viz: the 

 Rh. pseudoplatani n. sp., and Rh. acerinmn. Spore infection is 

 said to take place through the stomates on the lower surface of 

 the leaf, the period of incubation being about eight weeks in 

 the open. 



To insure a rich infection in nature the sclerotia should suf- 

 ficiently mature before leaf-fall and they should have sufficient 

 moisture to mature the ascospores in spring. The ascospores 

 have a thicker gelatinous coat which causes them to adhere to 

 the leaves. 



The author promises an exhaustive article in a forthcoming 

 number of the Centralblatt fur Bakteriologie. 



Ueber das hiologische Verhalten von Rhylisma acerinum auf ver- 

 schiedenen Ahornarten. Ber deutsch. hot. Gesell 30, July 1912. Pp. 385- 

 391- 



The root disease of various conifers which 

 Rhisina is prevalent in France and Germany and 



and is said to be due to Rhisina inflata 



Fires. (Schaff.) Sace, is generally thought to start 



around the seat of fires lighted by woods- 

 men and tramps. From these points it seems to spread out in 

 a circular area. 



Mangin made observations on the fungus, following the bad 

 fires of the past summer at Fontainebleau, and maintains that 



