208 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Notes on Tilletise. — F. Bubals* has added another to the three 

 known species of Tilletia on cultivated cereals. It grows on Hordeum 

 and infests the seedling plants. The spore masses are violet-brown and 

 fill the sheaths of the seeds. The epispore in the new species is much 

 darker than in the other species of the genus. 



P. Magnus | described in Hedwigia J a form of Tilletia in the fruits 

 of Bromus secalinus, which he named Tilletia Belgradensis. He has 

 been informed by Hariot that the same fungus was described on Bromus 

 erectus as Tilletia guyotiana in 1900. Bubak also found it on Bromus 

 arvensis in Bulgaria, and described it as Tilletia VelenovsJcyi. Hariot's 

 name being the earliest takes precedence. The fungus has been now 

 reported on three species of Bromus, and has been collected in France, 

 Servia, Bulgaria, and Russia. 



OttoAppel§ has experimented with barley and wheat to test the value 

 of hot water as a fungicide. It was found that the treatment was 

 absolutely effective in killing the smut spores if the grain was first 

 soaked from 4 to 6 hours in water at a temperature of 20° to 30° 0., and 

 then treated either with water or air for about 20 minutes at a tempera- 

 ture of 50° to 54° C. These temperatures are quite harmless in their 

 effect on the germinating power of the seed. The double treatment 

 secures the germination of the fungus spores in the first soaking, and 

 their prompt destruction by the greatly increased heat. 



UredineaB. — W. Krieg || finds that Uromyces Dactylidis is a compound 

 Uredine, and after a series of cultures he concludes that it represents 

 four different species, all of which form their uredospores on Dactyl is 

 glomerata, and their JEcidium-i orrn on different plants — (1) on Ranun- 

 culus platanifolius, R. aconitiferus, R. alpestris, and R. glacialis ; (2) on 

 R. bidbosus and R. repens ; (3) on R. silvaticus, and (4) on R. lanuginosus. 



He points out that R. lulbosus and R. repens are also the alternative 

 hosts of Puccinia magnusiana. 



O. Schneider-Orelli % publishes notes on willow Melampsorse. He dis- 

 tinguishes three groups. In two the teleutospore membrane is not 

 thickened, but one has elongate, the other round uredospores, while the 

 third group has a thick wall to the teleutospores and round uredospores. 

 He also gives a special account of Cseoma Saxifrages. 



E. W. D. Holway,** in his Notes on Uredineae V., corrects the nomen- 

 clature of several species of Puccinia, and gives notes as to hosts and 

 locality. 



Ernst Schaffnit ff has devoted his attention to the question of the 

 capacity to germinate and the germination of uredo- and secidiospores 

 of rusts. Various authors have already written on the question, and 

 Eriksson adduced the lack of germinative capacity in these spores as 

 reason for the necessity of his mycoplasma theory. Schaffnit found as 

 a result of his experiments that temperature exerted considerable influ- 



* Zeitschr. Landw. Versuch. Oesterr. , xii. (1909) p. 545. See also Centralbl. 

 Bakt., xxv. (1909) pp. 526-7. 



t Hedwigia, xlix. (1909) p. 100. % Op. cit.,xlviii. (1908) p. 145. 



§ Ber. Deutsch. Bot. Gesell., xxvii. (1910) pp. 606-10. 



|| Centralbl. Bakt., 2te Abt., xxv. (1909) pp. 430-6. f Tom. cit., pp. 436-9. 



** Mycologia, ii. (1910) pp. 23-4. ft Ann. Mycol., vii. (1909) pp. 509-23. 



