622 Eumycetes. — Pflanzenkrankheiten. 



2. Sekt.: Wie Sekt. 1, aber Teleutosporen mit ausgezogenen 

 Ecken {H. Strophanti, H. Wrightiae)\ 



3. Sekt.: niedrige Säulenbildung ohne Sterigmenschichte {H. 

 helvola, Uredo Dioscoreae-aculeatae). 



In welche Sektion Uredo Thaji und U. Antidesmae gehören, ist 

 noch nicht eruierbar. — Ferner: Uredo Scheffleri (auf Blätter einer 

 Capparis oder Maerua), Aecidiurn ugandense (auf Blätter einer Tur- 

 raeä), Ustüago kanierunensis (an Infloreszensen von Pennisetum) , U. 

 Scheffleri (ebenda), Tilletia pulcherrima (an Ovarien von Ammochloa 

 subacaulis), Sorosporiiun tristachydis (an Ovarien einer Tristachya), 

 Dimer osporiiun apertum (auf dem Myzel einer Melidea an Blättern 

 einer Rhynchospora), Seynesia elegantula (auf den Blättern von 

 Xymalos), Asterina cotnbreti (auf Blättern von Conibretum tavetense)^ 

 Corynelia carpophila (an Früchten von Rapanea tneldtiophloea)^ As- 

 terostoniella africana (auf Blättern von Tylachium africanuin), Sep- 

 togloeum concentrictim (auf Blättern von Sansevieria guineensis). 



Matouschek (Wien). 



Byl, P. A. van der, Preliminary Investigation on the Dete- 

 rioration ofMaizeinfected with Diplodia Z.eae (Schw.) Lev. 

 (Trans. Roy. Soc. South Africa. IV. 3. p. 231-239. 1915.) 



Results are recorded of tests as to the chemical changes taking 

 place in maize infected with Diplodia Zeae. The infected grains 

 have a higher acidity than healthy grains. The}?- also give Ori's 

 reaction strongly. whereas health\^ maize gives onl}^ a slight effer- 

 vescence. Infected maize has a higher percentage both of ash and 

 of nitrogen than healthy material, but tests for fat gave. different 

 results in the laboratory and in the field. In the field the percentage 

 of fat was lower in infected material, a result which is explained 

 by the fact that the germ, which contains most fat, was injured by 

 the fungus at an early stage of growth. 



The acidity tests appear to be most useful for practical purposes. 



E. M. Wakefield (Kew). 



Brown, N. A. and C. O. Jamieson. A bacteriumcausinga 

 disease of Sugar-beet and Nasturtiujn-\ea.^es. (Journ. Agric. 

 Research. I. p. 189—210. PI. 17—19. 5 Fig. 1914.) 



The authors summarize their results as follows: 



The leaf spot diseases of sugar beet and Nasturtitim described 

 in this paper are due to a bacterial organism. 



The two diseases occurred during the same summer. The causal 

 organism was isolated in pure cultures from both hosts and proved 

 infectious to sugar-beet and NasturtiumAecives interchangeably. 



It is proved from cultural, morphological, and inoculation tests 

 that the organisms causing these leaf-spot diseases on both hosts 

 are identical. 



The organism is also infectious to bean leaves and pods, let- 

 tuce, pepper, and eggplant. 



It probably enters the plant through wounds or by means of 

 insect injuries and may be spread by insects. 



The organism is a bacterium belonging to the green fluorescent 

 group. It is proved to be different from Bacterium xanthochloruni, 

 which is pathogenic to potato, and from Pseudomonas tenuis, which 

 has been given the same group number. 



