Myxomycetes. — Pflanzenkrankheiten. 381 



drei Gruppen: 1. Holzbewohnendr Arten, 2. Bewohner der sogen. 

 Rohhumus- oder Torfschichten, 3. Bewohner von krautigen, in Fäul- 

 nis übergegangenen Pflanzenteilen. Verf. schildert dan eingehend 

 die Myxomycetenflora der Laub- und Nadelholzwälder, der Erlen- 

 bruche und Birkengehölze sowie diejenige der Haufen krautiger, 

 faulender Pflanzenteile. Den Abschluss des ersten Teils bildet eine 

 Zusammenstellung von 20 für Norddeutschland neuen und 25 

 seltenen Arten und Varietäten. Die Zahl der für Norddeutsch- 

 land überhaupt bekannt gewordenen Arten beträgt ca 130; hervor- 

 hebenswert ist die Uebereinstimmung der Myxomycetenflora Nord- 

 deutschlands mit derjenigen Englands. 



Der zweite Teil enthält das Verzeichnis der im nordöstlichen 

 Holstein gesammelten Myxomyceten unter genauer Bezeichnung 

 der Fundorte und Fundzeiten. Neu aufgestellt werden Fuligo Can- 

 dida Jahn nov. spec. sowie die Varietäten Physarum luteo-album 

 List. var. aiireum Rönn. nov. var., Chondrioderma radiatum (L.) 

 Rost. var. rubrum Rönn. nov. var. und Arcyria albida Pers. var. 

 carnea List. nov. var. Beigefügt ist der Arbeit ein Literaturver- 

 zeichnis. Leeke (Neubabelsberg). 



Mortensen, M. L., Om Sygdomme hos Kornartene foraars- 

 agede ved Fusariumangreb. [On diseases of the cereals 

 caused bv attacks of Fusarium). (Tidsskr. Landb. Plant. 

 XVIII. p. 177—272. Köbenhavn 1911.) 



A copious explanation of the various species of Fusarium , 

 hitherto described on the cereals, and their significance to the same, 

 given as a historical account of what has tili now appeared in this 

 country and abroad; Hiltner and Ihssen, Appel and Wollen- 

 weber as also all other recent authors are referred to, but also all 

 the older ones, those stating to have found Fusarium fungi, as well 

 as those, who have described attacks of diseases, incomprehensible 

 to them, but now supposed to have been attacks of Fusarium. 



The author maintains E. Rostrup to have been the first to prove, 

 that Fusarium lavenaceum) was able to infect the grain so that the 

 germinating crop was infected by Fusarium; in 1893 Rostrup had 

 noticed that Hordeum and Aveua were infected by Fusarium when 

 the grain was untreated, but sound, when the grain was treated; 

 in the following year he made the same Observation as to Seeale. 



The author also gives information on several observations made 

 by himself. J. Lind (Copenhagen). 



Rostrup, O., Afbildninger a f Svampesygdo m me og In sek- 

 tangreb paa Havepl anter. [Drawings of diseases of 

 fungi and of attacks of insects on garden plan ts]. Kö- 

 benhavn 1911.) 



The drawings are quite true representations of diseased gar- 

 den-plants; in the present series five kinds of attacks are found viz: 

 Puccinia Ribis, Gloeosporium lindem uthianum , Monilia chierea, Psila 

 rosae and Gastropacha neustria. 



It is intended, to issue seven similar series each containing 5 

 plates. Each plate is 42 X 32 cm and printed in 8 colours; it is 

 furnished with a short text, and each series is aecompanied by a 

 longer text (in different languages) describinsf the diseases and 

 giving directions for their control. J. Lind (Copenhagen). 



