486 Algae. — Ptianzenkrankheiten. 



folgende Gruppierung des Planktons in Bezug auf das Vorkommen 

 dieser Gattung: ein ^3'/)Äa/m3'/'oplankton der brackischen Ge- 

 wässer am Seeufer (Chaetoceros Mülleri Lern., Vistiüae Apst., Bor- 

 gei Lem., subsalsum Lern.) und ein Hyphalmyro-p\a.n^iorv der sal- 

 zigen Binnengewässer mit Chaetoceros dtchaeta Ehrh., Zac/iariasi 

 (Hgm.), Müllen Lem. pro parte. Der Zusammenhang der ersten 

 Gruppe mit pelagischen Formen ist klar; die Erklärung des Vor- 

 kommen der anderen Gruppen in Binnengewässern begegnet Schwie- 

 rigkeiten; wahrscheinlich wird man diese Formen auch in süssen 

 Wässern als kosmopolitische Planktonkomponenten linden. 



Im Prester-See fand Verf. mit voriger Art auch Attheya Za- 

 chariasi Brun. (= Acanthoceras inagdebuvgense Honigm.). Die Ent- 

 wicklungsstadien werden auch hier beschrieben und abgebildet. 



Chaetoceros, Peragallia, Attheya und Rhisosolenia gehören auf 

 Grund der Aehnlichkeit der Dauersporen von Chaetoceros und At- 

 theya im Sinne Forti's (1912) zu einer Gruppe. 



Matouschek (Wien). 



Butler, E. J., Diseases of Rice. (Agric. Research Inst. Pusa. 

 Bull. NO. 34. p. 28—36. 3 PI. Calcutta 1913.) 



More than half this ipaper is occupied with an account of a 

 Rice disease caused by an eelworm {Tylenchns angustus sp. rov.). 

 The remainder concerns the fungus diseases Tilletia horrida, Sclero- 

 tium Orysae and the false Smut, Ustilaghioidea virens, an ascomy- 

 cete. The latter is dealt with in some detail, füll S5monomy and 

 geographical distribution, being given, with notes on its structure 

 and Hfe-history in India. A. D. Cotton. 



Butler, A. J. and A. Hafiz Khan. Red Rot of Sugar Cane. 

 (Mem. Dept. Agric. India. IV. 205. p. 150—178. Oct. 1913.) 



In a former paper the author showed that the disease known 

 as Red Rot caused by the fungus Colletotrichum falcatuin was 

 largely propagated through the use of diseased setts. This State- 

 ment has since been controverted. In the presence memoire the 

 author goes over the evidence in greater detail and sets forth the 

 results of further work. He shows b}' experiments the serious results 

 following the planting of setts from diseased cases, and that, except 

 under untoward circumstances, red rot is kept within reasonable 

 limit if sound canes are employed. 



The infection of setts by spores is also described. Experiments 

 show that these may be readely infected after planting, and that 

 spore-infection below ground occurs. Wounds caused by boring- 

 insects admit the fungus, but these are not responsible in India 

 for many cases of infection. The commonest points of entry are the 

 shoot and root eyes of the nodes. The author further considers the 

 source of spore-supply, the relative susceptibilitj^ of different parts 

 of the cane, and the control of the disease; and he concludes with 

 a section dealing with the susceptibility of varieties grown in India. 



A. D. Cotton. 



Hedlund, T., Om de vanligaste sjukdomarne pä potatis. 

 [Ueber die gewöhnlichsten Krankheiten der Kartof- 

 fel]. (Tidskr. f. Landtmän. 55 pp. 2 Textfig. Lund 1913.] 



Verf. berichtet über die in Schweden auftretenden Krankheiten 



