Eumycetes. — Pflanzenkrankheiten. 45 



Tubeuf , C. von, Kultur parasitischerHysteriaceen. (Natw. 

 Jahrb. Land- und Forstwirtsch. VIII. p. 408—411. 1910.; 



Gemeinsam mit Ramaiengar (Indien) versuchte Verf. den 

 gemeinen Schüttepilz Lophoderrnium Pinastri auf künstlichen Sub- 

 straten (Gelatine, Brot etc.) zu züchten. Die Keimung der Sporen 

 erfolgt leicht auf Gelatine, desgleichen die Entwicklung des Mycels. 

 Als eigentümlich heben die Verf. hervor, dass die einzelnen Mycel- 

 fäden im Innern der Gelatine einen geschlängelten Verlauf nehmen 

 (eine Erscheinung welche vom Ref. schon öfter bei verschiedenen 

 anderen Pilzen beobachtet worden ist). Schlecht gedeiht das Schütte- 

 mycel auf Brot und Holz. Conidienfrüchte entstanden nur auf zer- 

 kleinerten und ganzen (sterilisirten) Kiefernnadeln. Diese P3^cniden 

 sind identisch mit den in der Natur an schüttekranken Kiefernna- 

 deln auftretenden Conidiengehäusen. Infektionsversuche an lebenden 

 Nadeln blieben auch diesmal (wie schon früher) erfolglos. Neger. 



Wager, H. and A. Peniston. The nucleus of the Yeas't Plant. 

 (Rep. brit. Assoc. Adv. Sei. Winnipeg. Sekt. K. p. 680—681. 1909.) 



The nucleus of the Yeast cell consists of a vacuole, together 

 with a homogeneous stainable body, the nucleolus, which is in close 

 contact with it on one side. Intimately connected with the nucleolus 

 is a granulär chromatin network. Chromatin granules occur in the 

 cytoplasm in the neighbourhood of the nucleolus. It is suggested 

 that the nuclear vacuole is possibly concerned with the elaboration 

 of chromatin. In the process of bud formation the nucleus divides 

 amitotically. In spore formation the nuclear vacuole and net-work 

 disappear before division takes place. Agnes Arber (Cambridge). 



Butler, E. J., The wilt disease ofPigeon-pea and the pa- 

 rasitism of Neocosmospora vasinfecta Smith. (Memoirs Depart. 

 Agric. India. Bot. Ser. II. n^^. 9. p. 1—60. 6 pl. 1910.) 



Pigeon-pea [Cajanus indicus) is subject to a wilt disease and 

 several forms of fungi can be detected in infected plants, including 

 a Nectria and a Fusarium. Experiments showed that pure cultures 

 of a fungus present on the bark of wilted pigeon-pea and agreeing 

 with the Cephalosporium and Fusarium stages of the Nectria are 

 capable of producing wilt, though pure cultures from Nectria asco- 

 spores failed to induce the disease. 



Perithecia of Neocosmospora vasinfecta also occur on the roots 

 of wilted plants and an outlinQ is given of earlier work on this 

 fungus on cotton, watermelon and cowpeas. 



Attempts were made to induce wilt in Pigeon-pea by inocula- 

 ting with Neocosmospora, the results indicating that this fungus 

 found on roots of wilted pigeon pea, cotton, indigo and gram plants 

 in India is not the cause of the disease in the first of these crops. 

 Further experiments wiih cross-inoculation show^ that this fungus is 

 purely saprophytic on the roots of various wilted plants. A detailed 

 account is given of the morphology and cultural characters of the 

 Indian fungus, establishing its identity with the Neocosmospora vas- 

 infecta of the United States, which has hitherto been accepted as 

 the cause of wilt disease. 



During the above investigations it had become evident that the 

 disease was a typical Fusarium wilt, but not connected with either 



