CLINTON: NORTH AMERICAN USTILAGINEAE. 
523 
190. Unger, F. Der Brand, etc. Exanth. Pflanz., 345-358. 1833. 
(Has general notes on smuts known at this time.) 
191. Vanderyst, H. Les Ustilaginees observees en Belgique. 1900. 
(Lists over 50 species giving tlieir distribution in Belgium.) 
192. Wakker, J. H. Untersuchungen liber den Einfluss parasitischer Pilze 
auf ihre Nahrpflanzen. Pringsh. Jahrb. Wiss. Bot., 24: 532-536. 1892. 
(Describes effect of Urocystis Violae and Ustilago Maydis on the tissues 
of their hosts, Viola odorata and Zea Mats. 
193. Walker, E. A Preliminary Report upon Treatment for Rice Smut. 
Bull. S. Car. Agr. Exp. Sta., 41: 15-31. 1899. 
(Gives effect of several fungicides upon the germination of rice seeds; 
also has general notes on preventive treatment by fungicides.) 
194. Ward, H. M. On the Structure and Life History of Enlyloma Ranun¬ 
culi (Bon.) Phil. Trans. Roy. Soc. London, 178 : 173-185. 1887. Illustr. 
(Describes and figures this fungus in its different stages of development.) 
195. Webber, H. J. A Preliminary Enumeration of the Rusts and Smuts 
of Nebraska. Bull. Neb. Agr. Exp. Sta., 11: 66-72. 1889. 
(Gives notes on 21 species of smuts collected in that State.) 
196. Weber, C. Ueber den Pilz der Wurzelanschwellungen von Juncus 
bufonius. Bot. Zeit., 42 : 369-379. 1884. Illustr. 
(Has a description of the spore development and germination of Schinzia 
cypericola Magn., and makes it the basis of a new genus Entorrhiza.) 
197. Wilcox, E. N. Bot. Gaz., 34 : 66. 1902. 
(States that Stipa Hassei is merely a malformed specimen of Stipa 
eminens Andersoni caused by a smut in the spikelets.) 
198. Winter, G. Einige Notizen iiber die Familie der Ustilagineen. Flora, 
59: 145-152, 161-172. 1876. Illustr. 
(Treats especially of Geminella Delastrina, Urocystis Colchici, Ustilago 
utriculosa, U. hypodytes , U. Ischaemi ; gives methods of spore formation 
and also of germination of G. Delastrina , and U. hypodytes.) 
199. Winter, G. Ustilagineae. Die Pilze, l 1 : 79-131. 1881. Illustr. 
(Gives descriptions of 7 genera and 86 species found in Germany, with 
hosts, synonymy, etc.; gives list of host plants arranged according to 
families.) 
200. Winter, G. and Demetrio, C. H. Beitragezur Pilz-flora von Missouri. 
Hedw., 24: 178-179. 1885. 
(List 7 species of smuts with their hosts.) 
201. Wolff, R. Beitrag zur Kenntniss der Ustilagineen. Bot. Zeit., 31 : 
657-661, 673-677, 689-694. 1873. Illustr. 
(Treats of rye smut, Urocystis occulta, dealing with infection of host, 
spore formation and germination.) 
202. Wolff, R. Der Brand des Getreides, 1-37. 1874. Illustr. 
(Describes method of infection, mycelium, spore formation, and ger¬ 
mination of Ustilago Carbo, U. destruens [ U. Panici-miliacei ], U. Maydis , 
Tilletia laevis , and Urocystis occulta.) 
203. Woronin, M. Beitrag zur Kenntniss der Ustilagineen. Abh. Senck. 
Nat. Ges., 12 : 559-591. 1882. Illustr. 
