210 SUMMARY OF CURRENT RESEARCHES RELATING TO 



growth of the Botrytis from these sclerotia. He discusses the probable 

 ■causes of infection and dissemination of the disease. 



Ustilago Panici miliacei. *■ — Y. Takahashi describes this fungus 

 which appears on the inflorescence which is changed into a smut pustule. 

 The author concludes from his observations that the fungus is a true 

 Sorosporium and should be named S. Panici miliacei. 



Uredo bistortarum D.C.f — P. Magnus discusses the synonymy of 

 this fungus. He finds that it has no connection with Puccinia bistortm. 

 It is identical with Ustilago bistortarum Korn. and with Tilletia bullata 

 described by Fuckel in the Symbolce mycologiae. 



Hyalospora Aspidiotus. % — For this fungus, placed first in the 

 form genus Uredo, then in Melampsorella, P. Magnus creates the new 

 genus Hyalospora, on account of the different form of the Uredo 

 sorus. The specific name is that originally given by Mougeot and 

 Nestler, viz. Polypodii dryopteridis. 



Effect of Mineral Starvation on the Parasitism of Puccinia. § — 

 Marshall Ward finds that lack of minerals in no way secures immunity 

 from infection, though seedlings deficient in phosphorus or in nitrogen 

 tend to show retardation of infection. He also finds that the uredospores 

 grown on the starved plants of Bromus are entirely normal, though smaller 

 in quantity, and can reinfect other plants. High cultivation does not 

 increase resistance or confer immunity, as the most vigorous spores were 

 produced on plants reared in a decoction of horse-dung ; the highly fed 

 plant yields more food-material for the fungus, but as long as the host 

 is living the fungus finds material for growth development. The paper 

 is well illustrated by figures in the test and by tables of results. 



[Cultures of UredineaB.|| — Fr. Bubak gives the results of his infec- 

 tion experiments on a number of Uredineae. Puccinia Balsamitm, he 

 finds, belongs to the Brachypuccinese ; JEcidium Thy mi is a stage of 

 Puccinia Stvpw ; Endophyllum Sedi is an JEcidium and is to be included 

 under Puccinia longissima ; JEcidium lactucinum forms its teleutospores 

 on Carex muricata. To Uromyces Scirpi belong JEcidia found on Glaux 

 maritima, Hippuris vulgaris, Sium latifolium, Pastinaca sativa, Berula 

 angustifolia, and Baucus carota. Infection experiments with Uromyces 

 Pooz were tried on Ranunculus repens and R. bidbosus, and spermogonia 

 were developed freely. Similar infections of R. nemorosus and it. Ficaria 

 gave no results. 



Germination of Teleutospores. f — V. H. Blackmail publishes a note 

 on the conditions of teleutospore germination and of sporidia formation 

 in the Uredineae. Different authors have figured and described the pro- 

 inycelium in some cases as extremely short, while in others it appears to be 

 several times the length of the teleutospore before the sporidia are given 

 off. Blackmail finds that the conditions of germination are alone re- 

 sponsible for this variation. If the spores germinate in moist air the 



* Bot. Mag. Tokyo, xvi. (1902) pp. 183-4 (1 pi.). 



t Htdwigia, Beibl. xli. (1902) pp. 223-4. J Torn, cit., pp. 224-5. 



§ Proc. Eoy. Soc, lxxi. (1902) pp. 138-51 (figs, in text). 



|| Centralbl. Bakt., ix. (1902) pp. 913-28 (figs, in text). 



1 New Phyt., ii. (1903) pp. 10-4 (6 figs.). 



