ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 681 



origin, he instituted a series of cultures with many different kinds of 

 fruits. He failed to find the yeasts that he sought, but he made 

 interesting notes of the various fungal organisms that developed in his 

 media, and he gives an account of them. Tliey comprise several species 

 of yeast, Torula, Mucor, and other filamentous fungi. 



New Pathogenic Yeast (Klein's Yeast).* — This yeast on which 

 E. Cohu has conducted a series of researches, was found by Klein along 

 with other pathogenic organisms in milk. He proved its injurious 

 nature on various small animals, and sent a pure culture to the Hygienic 

 Institute at Halle, where a further study was prosecuted by Cohu. The 

 yeast grew in a large variety of liquid media, and when planted on a 

 firm substratum it covered it over with a greyish shining layer. The 

 best culture medium of all was beer-wort with its natural acid reaction. 

 In it the yeast formed thick masses of the consistency of butter of a 

 yellow or brownish tinge. Experiments were made by Cohn as to its 

 effect on various animals. 



New Uredinese.'j" — J. T. Lindroth has published a list with dia- 

 gnoses of 30 new species of rusts from various countries. He thinks 

 that JEcidium thysselini, found on Thysselinum palustre, has probably its 

 teleut jspoie form on Oar ex; of JEcidium selini, which grows on Selinum 

 linearis, the uredo- and teleutospore stages grow on Polygonum viviparum. 

 The other species recorded are single stages of the rust, mostly the 

 teleutospore stage. 



Relationship between Pleospora and Helminthosporium.t — H. 

 Diedicke has been engaged in tracing the connection between the 

 conidial and ascus forms of these fungi lound growing on the same host. 

 He has conducted a series of culture and infection experiments on dif- 

 ferent grasses. He finds that the Helminthosporium species parasitic on 

 Bromus asper and Triticum repens are distinct from each other, and that 

 they are the conidial forms of Pleospora. The author considers that 

 the Pleospora is identical with PI. trichostoma Wint, but that form 

 species have developed on Bromus and on Triticum. The conidial form 

 belongs to Helminthosporium gramineum Eabenh., which has also de- 

 veloped form species on the different hosts. 



Infection Experiments with Uredir.eee.§ — Tubeuf has infected 

 plants of Epilobium angustifolium successfully with secidiospores of the 

 fir. The spores of Cseoma Abietis podinatae grew on Salix caprsea. 

 The witch's broom ascidium of the fir had been proved by'Eischer to be 

 connected with the fungus on Stellaria nemorum. Tubeuf infected also 

 Stellar ia media and Gerastium semi-decandrum with the same fungus, 

 and in each case reproduced another stage in the life-history of the 

 parasite. 



Rusts of the Umbellifer8e.|| — J. J. Lindroth has published his 

 study of the Uredineaa found on the above plants. In determining the 



* Centralbl. Bakt. l te Abt., xxxi. (1902) pp. 737-48. 



t Meddel. fr. Stockholms Hogskohs botaniska Institut, iv. (1901) p. 8. See 

 als«. Centralbl. Bakt,, 2* Abt., viii. (1902) pp. 812-3. 



t Centralbl. Bakt., ix. (1902) pp. 317-29 (9 tigs.). § Tom. cit., p. 241. 



|| Acta Soc. pro Fauna et Flora Fennica, xxii. No. 1, 224 pp. See also Hed- 

 wigia Beiblatt, xli. (1902) po. 151-3. 



