Bacteriologie. — Bryophyten. 521 



Rivas, D., Bacteria and other Fungi in Relation to the Soil. 

 (Contr. Bot. Lab. Univ. Pennsylvania. III. 3. p. 243—274. 1910.) 



This paper describes the bacterial content of ten different sta- 

 tions chosen in virgin deciduous and hemlock forests along Crum 

 Creek, Penna, and gives the fluctuations in the number of bacteria 

 from month to month throughout the year, the largest number 

 being found in the months of September and October. The author 

 finds that a considerable number of species have the power of 

 carbohydrate digestion in the soil, thus freeing sugar v^hich probably 

 serves to supply in a hitherto undertermined manner, the different 

 forest herbs, shrubs and trees through the assistance of exotrophic 

 and endotrophic mycorhiza. John W. Harshberger. 



Zikes, H. , Ueber Bakterienzoogloeenbildung an den 

 Wurzeln der Gerstenpflanze. (Sitzungsber. kais. Akad. 

 Wiss. CXIX. Abth. I. 1. p. 11-21. 1910.) 



Verf. beobachtete als Ueberzug der Wurzelspitze der Gersten- 

 keimlinge Zoogloeen, die bei massenhaftem Auftreten einen roten 

 oder gelben Schleim bilden. Die sie zusammensetzenden Bakterien 

 kommen schon in der Gerstenfrucht vor, wie direct nachgewiesen 

 wurde. Die Keimpflanze wird durch das massenhafte Auftreten der 

 Zoogloeen geschädigt. Aus dem gelben Schleim hat Verf. 3 Bakte- 

 rienarten isoliert: Bacteriian ßuorescens liquefaciens, B. herbicola 

 anreiun var. und B. herbicola rubrum (selten). Die Gerstenwurzeln 

 werden am Wachstume gehindert durch die Reinkulturen der erst- 

 genannten, oder des letztgenannten, oder namentlich durch eine 

 Symbiose dieser 2 Bakterienarten. Matouschek (Wien). 



Britton , E, G. , A plea for more and better work. (The Bryol. 

 XIII. p. 30—32. March, 1910.) 



A paper read by title at the meeting of the SuUivant Moss 

 Society, Boston, Massachusetts, December 30, 1909. A plea for 

 extended, discriminating, and careful ecological study of mosses in 

 the field, the collection of füll and adequate suites of specimens at 

 different stages of growth and development, and the preservation 

 of complete biological data in relation thereto. The direct bearing 

 that painstaking work of this sort will have is pointedly illustrated in 

 the case of many of the most common or Polymorphie species. 



Maxon. 



Clark, L., Some notheworthy Hepaticae from the State of 

 Washington. (Bull. Torrey bot. Club. XXXVI. p. 299—307. pl. 20. 

 June 17, 1909.) 



The main physiographic features of the State of Washington 

 are described briefly. FoUowing this there is a brief comparison of 

 the hepatic flora of the State compared with those of adjacent regions. 

 Several papers on the subject are cited, indicating the course of 

 several records. The author has identified 101 species from Wa- 

 shington. In the present paper only 9 forms are treated, as foUows: 

 Asterella Lindenbergiana (Corda) Lindb., Pallavicinia Blytti (^o^xc^i) 

 Lindb., Nardia Breidleri (Limpr.) Lindb. and Scapania intermedia 

 (Husnot) Pearson, these being new to North America; three other 

 species new to the United States, but reported previously from 



