Fungi, Myxomyceten, Pathologie. 301 



Fisch.), the organism causing „scab" or "corkj'- scab" of Potatoes. 

 He agrees with Brunchorst in regarding Spongospora as a myxo- 

 mycete and shows that the development of the swarm-spores is si- 

 milar to that found in Ceratiomyxa. 



The spore-balls of the organism consist of a mass of spores ho- 

 neycombed by intercellular passages. The individual spores which 

 are very minute (3-5 ju) usually give rise, according to the author, 

 to eight pear-shaped swarm-spores. In stained preparations the young 

 spores as they become outlined in the Plasmodium show one large 

 and one or more degenerate nuclei. The large 'nucleus divides into 

 two, and the daughter-nuclei divide again until 8 nuclei are formed 

 in the spore. Each nucleus represents one swarm-spore. Freeswim- 

 ming swarm-spores were observed in fresh material, but the escape 

 of these bodies from the spore was not demonstrated. The intercel- 

 lular Spaces of the spore-ball are described as arising from the va- 

 cuoles of the plasmodium-like body, and hence are termed plas- 

 mogenetic. 



Though differing markedly from ordinary Myxomycetes Spon- 

 gospora approaches Ceratiomyxa. In the latter according to Tahu, 

 the ripe spores possess four small nuclei, each of which divides 

 into two, so that from the quadri-nucleate amoeboid body which 

 leaves the spore-case, eight uninucleate swarm-spores are produced. 



In the light of the observations recorded above, the assumed 

 life-history of the organism is put forward, the paper concluding 

 with practical suggestions for the agriculturalist. 



A. D. Cotton (Kew). 



Lind, J., Bemerkungen über einige parasitische Pilze 

 aus Russland. (Ann. myc. VI. p. 99—104. 1908.) 



Verf. berichtet über die Pilze (50 N^.) eines wenig bekannten, 

 im Botanischen Museum der Universität Kopenhagen aufbewahr- 

 ten Exsiccatenwerkes : N. C. Sredinsky Herbarium cryptogamicum 

 rossicum, sect. IV. Fungi. 



Es sind hauptsächlich Uredineen, Ustilagineen, einige Phycomy- 

 cetes und Erysipheen, darunter: Uroniyces Heliotropii Sredinsky; 

 ferner erwähnt Verf. hier einige auf russischen Pflanzen des Phane- 

 rogamenherbars wachsende Pilze, z.B. Uroniyces Chenopodii a.\xi Hali- 

 inocnentis occulta, Gloeosporium Veronicorum auf Veronica hede- 

 rifolia, Aecidium Raminculacearufn auf R. pidchellus, Doassansia 

 Martianoffiana Schroet. auf Potamogeton asiaticus u. a. 



Neger (Tharandt). 



Maipe, Rene, Champignons de Sao Paulo, (Bresil) fasc. 1. 

 (Ann. myc. VI. p. 144—153. Mit 1 Taf. und 7 Fig. 1908.) 



Unter den von Usteri gesammelten Pilzen v/aren folgende 

 Arten neu: Dinieriuni Giiinieri als Parasit auf Meliola atnphitricha, 

 Maireella Syd. n. gen. (eine Otthia, aber mündungslos und daher zu 

 den Perisporiaceen zu stellen) mit 1 Art: M. -tnacidans Syd. n. sp. 

 auf B. e. Composite(?), Asterina Usterii auf B. einer Euphorbiacee, 

 A. typhospora auf B. einer Myrtacee, Parmidaria dimorphospora 

 (gleiches Substrat), PhyUachora Petittnenginii (gleiches Substrat), 

 Placosphaeria pustidifor}nis auf B. einer Lauracee. 



Neger (Tharandt). 



