50 Pflanzenkrankheiten. — Lichenes. — ßryophyten. 



Boden. Durch das Vorhandensein blattrollkranker (mycelhaltiger) 

 Pflanzen wird der Boden verseucht und befähigt, die aus gesundem 

 Saatgut hervorgegangenen Kartoffeltrk be zu infizieren. Diese Infek- 

 tionsfähigkeit des Bodens scheint jedoch bei richtigem Zwischen- 

 fruchtbau ziemlich schnell abzunehmen. Inwieweit die Dauer dieser 

 Infektionsfähigkeit des Bodens von äusseren Umständen abhängig 

 ist, und ob es möglich ist, durch entsprechende Bodenbehandlung 

 und passenden Fruchtwechsel die Infektionsfähigkeit des Bodens zu 

 vernichten oder abzuschwächen müssen weitere Versuche erst zei- 

 gen. Am Schlüsse findet sich ein Sammelreferat über die im Jahre 

 1911 erschienenen die Blattrollkrankheit betreffenden Veröffentli 

 chungen und Arbeiten. Köck (Wien). 



Fink, B., The Nature and Classification of Lichens. I. (My- 

 cologia. III. p. 231-269. 1911.) 



In this paper, the first of a series, the writer gives the views 

 and arguments of botanists concerning the Classification of the 

 lichens. These views were obtained in answers to a circular letter 

 sent out by the author in 1909. Replies were reeeived from about one 

 hundred and fifteen botanists both American and European. This paper 

 takes up an analysis of these letters in the form of numerous quo- 

 tations and tables that show the tred of thought. One of the general 

 conclusions is to the effect that there has been a considerable growth 

 of opinion favoring the distribution of the lichens among the other 

 groups of fungi. R. J. Pool. 



Howe Jr., R. H., American species or Alectoria oecurring 

 north of the fifteenth Parallel. (Mycologia. III. p. 106— 150. 1911.) 



This long paper on the liehen genus Alectoria contains much 

 valuable material bearing upon this genus. A key to the species is 

 followed by specific descriptions, geographical distribution, etc., 

 and there are five plates containing twenty-six figures. There are 

 also five maps showing the ränge of some of the species. 



R. J. Pool. 



Burrell, W. H., Lophosia Schultsii (Nees) Schiffn. var. nov. 

 laxa. (Journ. Bot. IL. p. 217—219. London, July 1911.) 



The author gives an aecount of a new variet}^ of Lophosia 

 Schultsii, found in Norfolk in Juli 1909. It belongs to Leiocolea, K. 

 Müller's recent subgenus of Lophosia, and was at first assumed to be 

 L. Muelleri Dum. But V. Schiffn er showed it to be paroieous and 

 regarded it as a lax variety of L. Schultsii. Kaalaas came to much 

 the same conclusion. The author describes the plant and carefully 

 contrasts it with the type. A. Gepp. 



Cheetham, C. A., Some mosses new to the West Riding, 

 etc. (The Naturalist. N°. 653. p. 231—232. London, June 1911.) 



The author publishes notes upon a dozen rare mosses gathered 

 on unfrequented parts of Inglebro mountain in West Yorkshire. 

 The species are of the type met with in the Lake District. 

 They are mostly new records for West Yorkshire; one is new 

 for Yorkshire, and one Thuidium Philiberti, is new for England. 



A. Gepp. 



