Pflanzenkrankheiten. — Bryophyten. 669 



10 control this dry rot disease especially among potatoes kept in 

 storage. 



The inoculation experiments have proved, that F. trichothecioi- 

 des Wollenw. is a wound parasite, capable of destroying potato 

 lubers. The disease is clearly differentiated from the wilt and dry 

 rot ascribed b}^ Smith and Swingle to Fusarium oxyspovum 

 Schlecht. M. J. Sirks (Haarlem). 



Melhus, 1. E., Septovia pisi in relation to pea blight. (Phyto- 

 pathology. III. p. 51-58. 1913.) 



Inquiries as to the cause of certain damages to the pea crop in 

 Wisconsin led the wrlter to the study of this disease, that mani- 

 fested itself as follows: (1) in the destruction of some or all the 

 diseased plants early in June, following a spell of wet weather; 

 (2) in injury to the stems of plants less severly attacked so that the 

 pods did not fill or so that the plants wilted down and dried up 

 during the hot weather in the early part of July, before the pods 

 had reached suflicient maturity to be used for canning purposes. 



In these cases Ascochyta was not present in any quantity. but 

 another inperfect fungus, Septovia pisi, which has not heretofore, 

 been reported as very destructive, was associated in great abun- 

 dance. This led the writer. to take up the study of Septoria in order 

 to learn whether it might cause such Symptoms as were noted in 

 the field. as well as to learn its pathogenicity and distinguishing 

 characters, so that it might not be confused with Ascochyta pisi 



The artificial infection experiments show plainly that Septovia 

 pisi attacks and kills both the leaves and stems of the pea when 

 artificially infected and that the greatest injury results from stem 

 infection. Symptoms like those found in the blighted fields have 

 been produced, which suggests that the damage done in the open 

 may well have been due, in part at least, to the Septoria. 



The outdoor infection experiments showed that infection can 

 be obtained on pea plants in the open and that syptoms like those 

 found under field conditions develop. 



The sj'^mptoms of Septoria and Ascochyta are described in detail; 

 the Position oi Mycosphaevella pinodes (B. & Blox.) Johans. is regarded 

 as doubtful. though there are some tests given as very suggestive 

 as to the relations between this fungus and Ascochyta pisi. 



M. J. Sirks (Haarlem). 



O'Gara, P, J., A new disease of germinating wheat. 

 (Science, n. s. XLII. p. 313—314. Sept. 3. 1915.) 



Preliminary note on an unnamed species of Podosporiella. 



Trelease. 



O'Gara, P. J., Occurrence of the bacterial disease of 

 Sudangrass in the Salt Lake Valley, Utah. (Science, n. s. 

 XLII. p.^314— 315. Sept. 3. 1915.) 



Referring to BaciUus Sorghi on Andropogon Sorghum Sudanense. 



Trelease. 



Arnell, H. W. und C. Jensen. Mossvegetationen vid Ta- 

 ke rn. (Sjön Täkern fauna öch flora von K. Svenska Vetenskaps- 

 akademien herausgegeben. I. Stockholm, p. 1 — 37. 1915.) 



Der See Täkern in Oestergötland (Schweden) ist merk- 



