Pflanzenkrankheiten. — Bacteriologie. — Lichenes. 615 



punkte bekannt sind. Verf. empfiehlt in der ersten Hälfte des Juni 

 die stark befallenen Neupflanzungen und Zwergobstanlagen zu kon 

 trollieren und die leicht sichtbaren Puppen zu zerdrücken. Von 

 einem Abpflücken der befallenen Blätter rät er entschieden ab. 



Schätzlein (Weinsberg). 



Billiard, G., Complement ä la note sur une Bacterie pro- 

 ductrice de couleur verte. (Bull. Soc. bot. France. LVI. p. 

 556—561. 1909.) 



Billiard revient sur une Bacteriacee verte dont il a dejä ete 

 question dans le Bulletin de la Societe botanique (1909, p. 322 et 

 et 328). A cette epoque, il semble y avoir confusion et selon toute 

 probabilite, il s'agit de deux Bacteries differentes, l'une indiscuta- 

 blement verte, l'autre grise ou incolore, jouissant de la propriete de 

 colorer certains milieux en un beau vert. Cette matiere colorante 

 verte, formee en dehors des cellules ne saurait etre de la chloro- 

 phylle. Cette Bacterie serait nettement aerobie; eile prospere particu- 

 lierement dans les milieux les plus facilement putrefies et parait 

 etre depourvue de cils. 



II ne se developpe pas d'indol dans les cultures qui ne presen- 

 tent aucune odeur particuliere. Billiard propose pour cette Bacteria- 

 cee nouvelle le nom de Bacillus viridescens. 



L'autre espece dont il avait ete dejä question est le Bacillus 

 virescens Dangeard. P. Hariot. 



Blichfeldt, S- H. and L. E. Walbum. Microorganisms. Pu- 

 blished by „ Farmace vtisk Med hjaelper forening". (Co- 

 penhagen, 1908. 388 pp. 4°. with 166 figs. in the text.) 



It is a manual to be used by bacteriological and zymotechnical 

 laboratories as also a class-book to be used at such Colleges were 

 bacteriology, fermenting physiology and cultivation of microorga- 

 nisms are taught. It encludes the systematic of fungi and bacteria 

 as also a detailed account of their substance-changing productions, 

 the effect of outer factors on them, the methods, known for pure 

 cultivation of all technically important microorganisms and directions 

 for Sterilisation and desinfection. J. Lind (Copenhagen). 



Fred, E. B. and W. B. Eilet. The fixation of nitrogen by 

 means of Bacillus radicicola without the presence of a 

 legume. (Plant World. XII. p. 131 — 135. flg. 1. 1909.) 



The nitrogen assimilating power of Bacillus radicicola is recorded 

 in (1) a nitrogen-free liquid medium using pure and mixed cultures, 

 (2) in sterilized sand and (3) in normal clay soil, with the conclu- 

 sion that while the quantity was small in all cases, B. radicicola 

 will live in the soil free from the host plant and accomplish a cer- 

 tain amount of nitrogen assimilation. Trelease. 



Fink, B., The composition of a Desert Liehen Flora. (Myco- 

 logia. I. p. 87-103. 1909). 



A brief study of the ecologic relations of some desert lichens 

 collected in the vicinity of the Desert Botanical Laboratory of the 



