70 Algae. — ^ungi, Bacteria und Pathologie. 



selben getödtet war. — Ferner gelang es aber durch Behand- 

 lung der Körner mit alkoholischer Sublimatlösung wirklich: 

 absolut sterile Gerste zu erhalten, welche jedoch entgegen der 

 Nilson'schen Behauptung üppig keimte. Koeppen (Danzig). 



Petkoff, St., Troisieme contribution ä l'etude des^ 

 algues d'eau douce de Bulgarie. (Avec deux fig. dans 

 le texte et resume en francais. Perioditchesko Spissanie^ 

 LXV. 1904. p. 32.) 



Les riches materiaux determines pour ce travail de 

 M. le prof. Dr. Petkoff proviennent des eaux douces a cou- 

 rant rapide et lent du massif du Rhodope. L'auteur a recolte 

 surtout dans les ramifications nord du Do spat h et dans la 

 montagne de Tchepelare^ d'oü il a rapporte une cinquan- 

 taine d'especes, de varietes et de formes nouvelles pour la 

 Bulgarie. Nicoloit. 



Davis, J. J., A new species of Svnchytrium. (lournal ot 



Mycology. XI. July 1905. p. 154—156. Figs. 2.) 



Describes Synchytriiim scirpi n. sp. Davis on leaves of Scirpus- 

 atrovirens Muhl. in Kenosha County_, Wisconsin. 



Perley Spaulding. 



Freeman, E. M., Minnesota Plant Diseases. (St. PauL 

 Minnesota. July 1905.) 



The author has prepared a populär description of the fungi growing 

 in the state of M in n e s o t a, for the general information of the public. 

 As stated in the preface, the work is intended to be educational, rather 

 than immediately practical. 



The work is divided into twenty-tvvo chapters dealing first of all 

 with the question of fungi in general, their nutrition, reproduction, para- 

 sitism, the relation of fungi to plant diseases^ and a general description 

 of the various groups of fungi, their spore formation, general appearance, . 

 etc. This part is followed by a discussion of the economic aspects ot 

 fungi in their relation to plant disease and the methods used for stopping, 

 the spread of the disease. 



Several chapters are devoted to diseases of timber and shade trees, 

 diseases of field and forage crops, orchards and vineyards, and greeu- 

 house and ornamental plants. The volume published by the Regents 

 of the State University as No. 5 of the botanical series of the State 

 geological and Natural History Survey, is handsomely illustrated with 

 211figures, most of them Photographie reproductions which adds materi- 

 ally to the educational value of the work. H. von Schrenk. 



Heinricher, E., Exoascus C^ra5/(Fuck.) Sadeb. als günstiger 



Repräsentant Hexenbesen bildender Pilze für 



pllanzenbiologische Gruppen. (Naturw. Zeitschr. f. 



Land- und Forstwirthschaft. Bd. III. 1905. p. 344—348.) 



Verf. verfügt in den biologischen Anlagen des Innsbruck er- 

 Gartens über 4 Hexenbesen tragende Bäume, nämlich an der Weisstanne 

 (Aec. elatinum), an der Berberitze (Aecidium graveolens), an der Grau- 

 erle (Exoascus epiphyllus) und an der Kirsche (Exoascus Cerasi). Die 

 Hexenbesen an der Erle sterben meist bald ab, bilden sich aber stets 

 durch spontane Infection wieder reichlich neu. Den Hexenbesen auf der 



