ZOOLOGY, AND BOTANY, MICROSCOPY, ETC. 87 



Ed. Fischer* gives a list of Uredineae found in Switzerland in 19<); J >, 

 ■with a description of one new species. He has also found by experi- 

 ment that JEcidium Linos yridis produces its teleutospores on Car ex 

 humilis. 



In "Notes on Uredineas III." E. W. D. Holwey f gives a detailed 

 account of some plants of Puccinia atrofusca first described as a 

 i Womyces. He describes the amphispores of the species, thick-walled 

 and echinulate, with two equatorial germ-spores. 



V. Brizi % describes a disease of Cichorium Endivia, the leaves of 

 which were covered with brown pustules. The mischief was caused by 

 Puccinia Prenanthidis. 



J. C. Arthur § has proved by experiment that the ^Ecidium of 

 Oxalis cymosa is synonymous with Puccinia Sorghii, the rust of Zea 

 Mays. He gives further notes on the occurrence of iEcidia on various 

 species of Oxalis. 



Infection Experiments with Uredinea3.|| — Fr. Bubak gives us a 

 long account of these, and the results arrived at. He experimented 

 with the rusts found on Adorn moschatellina, and determined three 

 different forms : an iEcidiurn of Puccinia aryentata, with perennial 

 mycelium ; a Micropuccinia — Puce. Adoxa — also with perennial my- 

 celium ; and Puccinia albescens. Many of the experiments gave only 

 negative results. He established that Melampsorella Symphyti was 

 connected with an J3cidium on Abies pectinata, which is different from 

 all those hitherto described on firs. 



C. M. C4ibsonf has carried out a number of experiments, having for 

 their object the testing of the behaviour of the rust hyphaa after enter- 

 ing a leaf. As a rule she chose plants that would not readily be infected 

 by the rust spores which she used for experiment. The spore usually 

 germinates, and the tube enters or attempts to enter the stoma, but if 

 the host be unfavourable srreat differences of development take place : 

 the hyphas penetrate no farther than the opening or persist until they 

 reach the spongy tissue. In two or four days the hyphge were dead, 

 probably poisoned by some substance in the plant cells. The writer also 

 gives details of inoculation with rusts on similar hosts that had been 

 previously immune to attack. She describes the conditions under which 

 they became liable to infection, and the action of the rust spores on 

 these plants. 



Distribution of Uredineae on their Host Plants.** — P. Dietel 

 repeats Klebahn's statement that, as far as our present knowledge goes, 

 no rule can be formulated as to the selection of host plants by the 

 hetercecious rusts. He then examines the matter, and endeavours to 

 trace some general law of selection. He finds, for instance, that in the 

 evolution of the species, that is, in its selection of new hosts, a more 



* Ber. Schweiz. bot. Ges., xiv.(1904) p. 17. See also Bot. Centralbl.,xcvi. (1904) 

 pp. 385-6. f Journ. MyooL, x. (1904) p. '228. 



I Agric. Moderna, x. (1904) pp. 32-3. See also Centralbl. Bakt., xiii. (1904) p. 471 . 

 § Bjt. Gazette, xxxviii. (1904) pp. 64-7. See also Bot. Centralbl., xcvi. (1904) 



P- 547. || Centralbl. Bakt., xii. (1904) pp. 411-26. 



II New Phytol., iii. (1904) pp. 184-91 (2 pis.). 

 •* Centralbl. Bakt., xi. (1904) pp. 218-34 



