72 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Monograph of the Uredinese.* — The second fascicle of P. and H. 

 Sydow's great work has now appeared. It includes species of Puccinia 

 on plants of the natural orders Goodeniacese to Umbelliferge. The plates 

 illustrate the different forms of the teleutospores ; they contain 155 

 figures. 



Specialisation of Rusts.j — Jakob Eriksson continues his re- 

 searches on the forms of Puccinia graminis. He has carried out 

 infection experiments in Sweden on a large number of grasses, and he 

 gives detailed tabulated results with extensive notes on the phenomena 

 observed. He also contrasts his results with those arrived at in America 

 by similar experimenters. He finds that the prevailing forms in the two 

 countries do not agree, even on the same host-plants. Specialisation has 

 proceeded on different lines. 



Rust on Vanilla.^ — G. Delacroix found on some fruits of vanilla 

 from Tahiti, not only the form of disease due to Glwosporium Vanilla, 

 but the uredospores and teleutospores of a species of Uromyces. Careful 

 examination proved it to be a new species, U. Joffrini. 



Experiments on the Brown Rust of Bromes.§ — E. M. Freeman has 

 •continued a part of the work begun by Marshall Ward, the special object 

 in the investigation being to test the infection capabilities of numerous 

 species of Bromus and so determine more accurately the systematic 

 position of the grasses. Uredospores of Puccinia dispersa were used 

 from sori on B. mollis and B. sterilis. A series of 22 species is given 

 that could not be successfully infected with either set of spores ; 12 species 

 were susceptible to the spores from B. mollis, but not to those of 

 B. sterilis ; 5 species are given in which infection from both was success- 

 ful, but in very varying degree. The writer gathers evidence from 

 these experiments as to the connection of these Bromes with the mollis 

 or sterilis group. 



Researches on Rusts. || — E. Fischer has published an account of his 

 infection experiments with various Uredineas. He deals with the Puc- 

 cinige of Polygonum Bistorta, and also with species of Cronartium, 

 Melampsorella, and Thecopsora. The growth of the latter, Thecopsora 

 Padi, was induced on Primus viryiniana by infection of the spores of 

 ^Ecidium strobilinum, and the uredospores appeared a second year on 

 the Primus. 



Genus Amanita.^ — M. E. Boudier gives a review of the principal 

 species of this genus with exhaustive notes. He includes 3 species of 

 Amanitopsis, which he considers a sub-genus. 



North American PolyporeaB.** — W. A. Murrill has studied the genus 

 Ganoderma. There are 7 representatives of the genus in N. America, 

 several of which are described for the first time. Polyporus lucidus, the 



* P. and H. Sydow, Monographia Ureflinf-avum, vol. i. fuse. ii. Leipzig, 1902, 

 192 pp. and 12 pis. f Centralbl. B.ikt, ix. (1902) pp. 590-607. 



% Bull. Soc. Myc, xviii. (1902) p. 284 (4 tigs.). 

 § Ann. Bot., xvi. (1902) pp. 487-94. 



1| Ber. d. Schweiz. bot. Ges., xii. (1902) p. 9. Cf. Bot. Zeit, lx. (1902) p. 246. 

 f Bull. Soc. Mvc, xviii. (1902) pp. 251-73 (1 pi.). 

 ** Bull. Torrey Bot. Club, xxix. (1902) pp. 599-608. 



