Algae. — Fungi. 307 



gloia sp., Naviciila sp., Paralia sulcata var. radlata ? Green., 

 Cocconeis placentula ? Ehrenb. , Surlnaga splendida Kuetz., 

 Melosira sp., Homoecladla Martiana Arg., Fragilaria sp. et 

 des colonies de Coccaceae et Bacteriaceae. 



La flore „dysphotique" du lacNgebel est donc constituee 

 uniquement par des Diatomees et des bacteries, les premieres 

 en plus grand nombre. E. de Wildeman. 



Moore, George T., New or LittleKnownUnicellular 



Algae. II. Eremosphaera viridis and Excentrosphaera. 



(Botanical Gazette. XXXII. p. 309—324. Pls. X, XI, XII. 

 1901.) 



This is a contlnuation of a series of articles on unicellular algae 

 begun in Vol. XXX of the Gazette. It discusses the distribution, struc- 

 tiire and development of Eremosphaera viridis. Methods of cultivation 

 are given and after more than three years Observation in pure cultures 

 the conclusion is reached that it is not Polymorphie as has been des- 

 cribed, but should be retained in the Protococcoideae. 



A new genus Excentrosphaera with the Single species E. viridis is 

 described. This is likewise classed ander the Protococcoideae. 



V. Schränk (St. Louis). 



LiviNGSTON, B. E., Further notes on the physiology of 

 polymorph ism in green algae. (Botanical Gazette. 

 XXXII. p. 292—302. October 1901.) 



Stigeoclonium teniie was used in tests with various sub- 

 stances. Osmotic pressures were found to be the Controlling 

 features of any medium, and the threshhold of Inhibition of 

 zoospore formation is at a higher concentration in non-electro- 

 lytes than in electrolytes. This alga was also able to with- 

 stand higher concentrations of non-electrolytes than electrolytes. 

 The threshhold of Stimulation for the palmella-form is at a 

 higher concentration for cane sugar than for lactose. 



Mac Dougal. 



DuMEE, P. et Maire, R., Remarques sur les uredospores 



de Piiccinia Priini Pers. (Bulletin de la Societe mycologi- 



que de France. T. XVII. p. 308—310. Avec une figure). 



A cote des uredospores typiques, on trouve, dans les memes sores; 

 1" des paraphyses, qui ne sont autres que des spores avortees, car on 

 trouve tous les intermediaires entre la paraphyse franche et la spore 

 bien caracterisee; 2" „des uredospores teleutosporiformes" qui ont un 

 sommet epais&i comme des teleutospores A' Uromyces , mais qui se 

 rattachent neanmoins aux uredospores typiques par leurs noyaux petits 

 et restant au nombre de deux et par la presence de deux ou trois pores 

 de germination. Paul Vuillemin. 



Gueguen, f., Le Schizophylliim commune, parasite du 

 Marronnier d'Inde. (Bulletin de la Societe mycologique 

 de France. T. XVII. Fase. IV. p. 283—298. Avec 5 fig. 

 15. decembre 1901.) 



Des Aesculus ayant le tronc gros comme le bras, bordant une allee 

 de jardin a Sable (Sarthe), presentent un grand nombre de fructi- 



20* 



