Orton: Correlation between Puccinia and Uromyces 199 



The next species to attract particular attention and which are 

 undoubtedly correlated are a Puccinia passing under several 

 names (P. Caricis-Asteris, P. Caricis-Solidaginis, P. Caricis-eri- 

 gerontis) on various species of Carex, having aecia on Aster, Sol- 

 idago, Erigeron, and close relatives,^^ and Uromyces perigynius 

 Hals. (U. caricina E. & E.) on several species of Carex which is 

 known to have its aecia on Solidago and Aster.^^ The aecia of 

 the two species appear identical and a careful microscopical study 

 reveals that the peridial cells and aeciospores cannot be differen- 

 tiated. The urediniospores of the Puccinia measure 14-19 by 18- 

 24 ju,, are light cinnamon-brown with a wall about 1.5 thick, mod- 

 erately echinulate and have 2 superequatorial pores. A compar- 

 ison of the urediniospores of Uromyces perigynius shows that 

 they are identical in all their characters with the Puccinia form. 

 The teliospores of the two species also possess identical characters 

 except number of cells, having thin walls and rather thick apices. 

 The distribution of the two is practically the same, extending 

 across the northern half of the United States and into Canada. 

 Three of the telial hosts, Carex intumescens Rudge, C. scoparia 

 Schk., and C. trihuloides Wahl. are the same for both species. 



A rust on species of Andropogon, Puccinia Ellisiana Thiim., 

 has been in cultures^^ four different years on various hosts with- 

 out success. It is a form widely distributed throughout the 

 United States east of the Rocky mountains and in Mexico, and had 

 puzzled us much until Dr. J. F. Brenckle, of Kulm, North Dakota, 

 wrote on June 5, 191 1, that he had found aecia on Viola near 

 Puccinia Ellisiana. In a later communication he mentioned evi- 

 dence to verify this probable connection. The suggestion seems 

 very likely for in the Arthur Herbarium there are collections of 

 aecia on Viola within the range of this rust which are out of the 

 range of the Uromyces on Andropogon and which have peridial 

 cells and aeciospores that are clearly differentiated, when care- 

 fully compared microscopically, from the autoecious rusts on 

 Viola. On a careful study of Puccinia Ellisiana we find that 



^Jour. Myc. 8: 53-54- 1902; Bot. Gaz. 35: 15, 21, 1903; Jour. Myc. 11: 

 58. 1905; 12: 15. 1906; 14: 13. 1908; Mycologia i: 233. 1909 ; 2: 224. 1910. 

 ^ Mycologia 4: 21. 1912. 



^Jour. Myc. 14: 10. 1908; Mycologia i: 231. 1909; 2: 220. 1910; 4: 9. 1912. 



