Eumycetes. 59 



places in 2 sheets of ground quite equal, and one sort of seed has 

 produced diseased plants and the other sort sound ones. 



The infection may also be spread bj^ the wind , with particles of 

 dr\' sand. 



The author has particularh'^ endeavoured to find out if the pre- 

 sence of the PlasmodiopJiora is more due to its power of propagation 

 or of the conditions of its existence, and he results in stating that 

 surely some areas are still found, which have not been infected, 

 because the disease has not yet reached that place, but the prin- 

 cipal cause of its nonexistence is, that the localities are unfavour- 

 able to its growth. So he discusses these conditions. The article is 

 accompanied by 4 maps, showing the growing places of the fungus 

 and the different sorts of soil. It is to be seen b\' these maps that 

 the isle of A mager, where cabbage has especially been cultivated 

 for hundreds of years, is quite free from Plasmodiophora, and that 

 the parts of Jutland, which have only recently been cultivated, 

 are most attacked. There is also a remarkable conformity between 

 certain geological circumstances and "Finger and Toe". West of a 

 border, formed by the moraine of the glacial period, the soil is 

 Sandy and the fungus common. East of the said border the soil is 

 fertile and free from the fungus. The content of water of the soil 

 is very significant; in soil, which is easety heated through b)^ the 

 sun, the disease is never so severe as in moist soil. The content 

 of chalk of the soil is of equal significance, accordingly the author 

 recommends to supply chalk and drain the water. Besides the dif- 

 ferent sorts of turnips are not equaly disposed to infection; "Yellow 

 Tankard" more, and "Dales Hybrid" less. I. Lind (Copenhagen). 



Puttemans, A., Determinagäo das plantas por meio dos seus 

 parasitas. (Revista agricola p. 345 — 350. 1906.) 



L'auteur cite deux cas remarquables d'identification de plantes 

 superieures par l'etude de leurs Champignons parasites et insiste 

 sur les Services qu'une pareille identification peut rendre dans des 

 cas oü on dispose seulement d'exemplaires steriles. 



J. Huber (Parä). 



Puttemans, A., Relagäo dos fungos parasitarios observados 

 nos hortos de ensaios da Escola Polytechnica de S. Paulo 

 durante o anno de 1905 — 1906. (Extrait de l'Annuario da Escola 

 Polytechnica de S. Paulo paral l906.) 



Enumeration des Champignions parasites rencontres en 1905 et 

 1906 sur des plantes cultivees dans les jardins d'experience de l'Ecole 

 Pohnechnique de S. Paulo, disposees suivant leurs plantes nourri- 

 cieres dans l'ordre alphabetique. C'est un essai interessant qui merite 

 d'etre imite. J. Huber (Parä). 



Puttemans, A., Relation entre le Sclerodernta verrucosum et le 

 Quercus peduncidata. (Extrait de la Revista da Sociedade Scien- 

 tifica de S. Paulo (Bresil) 9—10. p. 137—138. B. 1907.) 



L'auteur a observe une relation constante entre le Quercus pedun- 

 cidata cultive ä S. Paulo (oü cet arbre europeen montre d'ailleurs 

 un developpement remarquable) et le Sclerodernta verrucosum, ce 

 qui l'amene ä soupconner un cas de veritable Symbiose. 



J. Huber (Parä). 



