Eumycetes. — Pflanzenkrankheiten. 197 



sammengestellt nach Hennings Hymenomyceten in En- 

 gler u. Prantl, Natürl. Pflanzenfam. I. 1. Abt. p. 105 — 276. 

 Redigiert von F. ßuchholz. V. Agaricaceae. (Herausgeg. vom 

 naturhist. Museum der Verfasserin, Selo Mihailowskoe im Gouv. 

 Moskau, p. 147—426. 97 Textfig. Riga 1909. Russisch.) 



Hennings bestimmte seinerzeit viele von der Verf. in Mittel- 

 russland gefundene Pilze. Material in grosser Menge stand zur 

 Verfügung, sodass das bisher in mykologischer Beziehung wenig 

 bekannte Gebiet jetzt zu den durchforschteren Ländern gehört. Die 

 Arbeit ist eine Umarbeitung des obengenannten Werkes, ganz für 

 die speziellen Bedürfnisse zugeschnitten. Es fehlen auch nicht die 

 Fundortsangaben. Diepllustrationen sind Reproduktionen Hennings'- 

 scher Figuren. Matouschek (Wien). 



Arzberger, F. G., Fungous root-tubercles of Ceanothns 

 aniericanus, Elaegnus argentea and Myrica cerifera. (Rept. Mis- 

 souri Bot. Gard. XXI. p. 60—102. pl. 6—14. Dec. 22. 1910.) 



Ceanothus: The tubercle consists of an outer corky layer, an 

 inner vascular cylinder and the middle or cortex which contains 

 the infected cells. Three stages of fungal development are noted, 

 (1) the mycelial, (2) the sporangial and (3) where all but the walls 

 of the mycelium are absorbed. As the result of infection, hyper- 

 trophied cells and nuclei are formed, the fungus finally dissolving 

 the walls of the host cell. The host nucleus increases in volume as 

 well as the nucleole and chromatin. Finally both the host cell and 

 fungus die. 



Elaegnus: External and internal infection takes place as in 

 Ceanothus, but the walls of the host are not broken down as a 

 result of the infection and the fungus is not entirely absorbed, 

 although both host cell and fungus die. No. "Exkretkörperchen" 

 were found. 



Alnus: The fungus confines itself to one or two layers of cells 

 and no hypertrophy or symbiotic relationship exists. The fungus 

 apparently belongs to the genus Actinomyces and may be regarded 

 as a true parasite. 



In the tubercles of Alnus and Ceanothus enzymes capable of 

 digesting fibrin are present. Moore. 



Dandeno, J. B., Investigation ofthe toxic action of Bor- 

 deaux mixture. (Mich. Acad. Science, llth Report, p. 30—32. 



Continuation of the work reported in tenth report of Mich. 

 Acad. of Science. The toxicity of the supernatant liquid was tested 

 by growing in it seedlings of pea, com and lupin, and all three 

 tolerated a Solution strength of V32 ofthe ordinary formula 5—4—50, 

 which constituted the stock Solution. It developed that precipitate 

 and supernatant liquor fresh was about sixteen times less toxic than 

 the same Solution after Standing a month or more. Of two portions 

 of Bordeaux, one undiluted, the other diluted to about ^250 and set 

 aside for a month, the lupin stood a strength ofthe undiluted when 

 made Solution about four times as great as that diluted before 

 Standing. Com seedlings grew in supernatant liquid of x / 4 strength 

 when it would not grow in' 1 / 8 dilution. This is accounted for because 

 of the more rapid decomposition which goes on in dilute Solutions. 

 All of the results tended to show that Bordeaux became more toxic 

 as it increased in age. Moore. 



