Pflanzenkrankheiten. — Bacteriologie. 203 



Weir, J. R., Some observations on abortive sporopho- 

 res of wood-destroy ing fungi. (Pliytopathology. V. p. 48 — 

 50. 1915.) 



Three forms of abortive fruiting structures are mentioned in this 

 paper: that of Fomes igniarius (L.) Gillet on alders and birches, that 

 of Echinodontiwn tinctorium on old and badly decayed western 

 hemlock and that of Trametes pini on the western white pine. 



About the causes Ibr formation of these abnormal structures in 

 Fomes igniarius, the authors remark: The abortive fruiting struc- 

 tures of F. igniarius practically in every case emerge from deep 

 open wounds, usually a „cat face." The fertile sporophores, on the 

 other band, more often appear directly through the bark or at 

 wounds where the vegetative mycelium is protected from external 

 influences. At such points of emergence the context of the fruiting 

 structure begins very early to form the hymenium which may be 

 producing spores when the sporophore is not more than an inch in 

 diameter. The collection of water in the deep open wounds, free- 

 zing and thawing, etc., has a tendency to maintain the mycelium 

 at the point ot exit in a constant vegetative condition; this and 

 the probable oxidation of certain chemical substances within the 

 wound due to exposure are probable causes for the formation of 

 the peculiar abnormalities." M. J. Sirks (Haarlem). 



Caud, A. und G. Sangiorgi. Untersuchungen über die 

 Mikrofauna der Böden aus Reisgegenden. (Cbl. Bakt. 2. 

 XLII. p. 393-398. 1914.) 



Zur Züchtung eigneten sich besonders gut die Nährlösungen 

 von Omelianski und Giltay. In gleicher Weise bebaute Böden 

 zeigten auch ähnliche Mikrofauna. Schüepp. 



Greaves, S. E. and H. P. Anderson. The influence of ar- 

 senic upon the nitrogen fixing power s of the soil. (Cbl, 

 Bakt. 2. XLII. p. 244—254. 1914.) 



Arsenic fördert die stickstoffbindende Kraft der Böden. Ein 

 Kurvenbild zeigt die fördernde und hemmende Wirkung verschie- 

 dener Arsenverbindungen bei verschiedener Konzentration. 



Schüepp. 



Kellermann, K„ Micrococci causing red deterioration of 

 salted Codfish. (Cbl. Bakt. 2. XLII. p. 398—402. 2 f.) 



Beschreibt Reinkulturen von Micrococcus litoralis und Micrococ- 

 cus litoralis gadidarum. Schüepp. 



Owen, W., Investigation or the comparative values of 

 various culture media for the quantitative deterrai- 

 nation ofmicroorganisms in cane sugar products. (Cbl. 

 Bakt. 2. XLII. p. 335-378. 6 f. 1914.) 



Die günstigte Reaktion der Nährböden ist neutral. Die Zucker- 

 mikroorganismen wachsen auf dichten Medien langsamer als auf 

 dünnen. Der Zuckeragar von Smith ist gut geeignet für die Be- 

 stimmung von Mikroorganismen in Zucker. Schüepp. 



