546 Algae. — f'ungi, Bacteria und Pathologie. 



land in August 1904. Mr. Paulsen gives figures of cells 

 with resting-spores from Iceland and for comparison figures 

 of cells from the CaspianSea; he thinks that C/?. subsalsum 

 ofLemmermann is perhaps identical with Ch. simplex. A 

 closeiy related form is described as A. simplex var. calcitrans 

 Pauls. C. H. Ostenfeld. 



BOLLEY, H. L, New Work upon Wheat Rust. (Science 



N. S. XXII. 1905. p. 50.) 



Announcement is definitely made that the „uredo spores of Puccinia 

 Graminis, in certain cases, may remain unimpaired by the actlon of the 

 drying winds of autumn and the intense cold of a North Dakota 

 Winter". Reference is made that it has already been shown that the 

 uredo stage of Puccinia rnbigo-vera, could pass the winter in the tissues 

 of the wheat plant uninjured, and that the uredo spores could survive 

 exposure to the drying air and sunshine of July and August, for over a 

 month, and that this species winters freely in Mississiopi, Texas^ 

 Illinois, Minnesota^ and North Dakota, both upon living leaves 

 of wheat or winter rye and upon the matured leaves and straw of the 

 same. „The matter of the barberry stage and other aecidial rusts niay 

 yet be proved to be of physiological necessity for the perpetuation of 

 the species, but it would seem that these need no longer be believed to 

 be a direct yearly necessity to the perpetuation of the rusts concerned." 



H. V. Schrenk. 



BOLLEY, H. L. and F. J. Pritchard, Internal Infection of 



the Wheat Grain by Rust. A new Observation, 



(Science N. S. XXII. 1905. p. 343.) 



The authors after referrinij to the manner in which rusts usually 

 develope plants with particular reference to their being disseminated by 

 the wind and other agencies trom plant to plant and from field to field, 

 State that it has been learned of late years that the rusts may persist 

 through their hyphae in roots and woody stems of plants. They like- 

 wise refer to their observations made during late years that rust may at 

 times attack wheat in some manner from the soll or seed. They refer 

 to the micoplasm theory of prof. Eriksson, and to his experiments, 

 which they, however, have not been able to confirm. Recently. hov/ever, 

 they have noted „that wheat grains from badly rusted mother plants 

 quite often^ Jndeed, in some strains are quite uniformly internaliy infected 

 by wheat rust filaments to such extent that spore beds are formed 

 bearing both uredo-spores and teleuto-spores beneath the bran layer". 

 They point out that if later experiments should confirm the possibility 

 of internal infection through the seed^ by way of its attachment^ it 

 would throw new light on the Eriksson micoplasm theory, and empha- 

 size the importance of proper seed selection and the gradirg of grain. 

 „The fact that rust thus attacks the wheat grain by way of its attach- 

 ment is also an apparent explanation of why rusted wheat often falls to 

 properly mature the seed even though there is yet plenty of strength in 

 the parent plant." H. v. Schrenk. 



BUBAK, Fr., Beitrag zur Kenntniss einiger üredineen. 



(Anna!, mycol. Vol. III. 1905. p. 217—224.) 



Nach Jordi sind auf Astragalus zwei Uromyces-KriGn zu unter- 

 scheiden. Den alten Speciesnamen Urom. Astragali (Opiz) Sacc. hatte 

 Jordi für die Art auf Astragalus exscapus beibehalten, die übrigen 

 Formen aber unter dem Namen Uromyces Eupliorbiae-Astragali 7Aisamm(in- 

 gefasst. Die Nomenclatur wird hier nur in der Weise richtig gestellt, 



